A book is a set of written, printed, illustrated, or blank sheets, made of ink, paper, parchment, or other materials, usually fastened together to hinge at one side. A single sheet within a book is called a leaf, and each side of a leaf is called a page. A book produced in electronic format is known as an electronic book (e-book).

Books may also refer to works of literature, or a main division of such a work. In library and information science, a book is called a monograph, to distinguish it from serial periodicals such as magazines, journals or newspapers. The body of all written works including books is literature. In novels and sometimes other types of books (for example, biographies), a book may be divided into several large sections, also called books (Book 1, Book 2, Book 3, and so on). A lover of books is usually referred to as a bibliophile or, more informally, a bookworm.

A store where books are bought and sold is a bookstore or bookshop. Books can also be borrowed from libraries. In 2010, Google estimated that since the invention of printing, approximately 130,000,000 unique titles had been published.

Psycho is slang for a person who is psychotic or psychopathic. The term is often considered offensive or derogatory. However, when used within compound terms such as 'psychology' or 'psychotherapy', the word refers neutrally to the psyche (mind or soul).

Psycho may also refer to:

Robert Albert Bloch (April 5, 1917 – September 23, 1994) was a prolific American writer, primarily of crime, horror and science fiction. He is best known as the writer of Psycho, the basis for the film of the same name by Alfred Hitchcock. He wrote that "Despite my ghoulish reputation, I really have the heart of a small boy. I keep it in a jar on my desk," (a quote borrowed by Stephen King and often misattributed to him). His fondness for a pun is evident in the titles of his story collections such as Tales in a Jugular Vein, Such Stuff as Screams Are Made Of and Out of the Mouths of Graves.

Bloch wrote hundreds of short stories and over 20 novels. He was one of the youngest members of the Lovecraft Circle. H. P. Lovecraft was Bloch's mentor and one of the first to seriously encourage his talent. However, while Bloch started his career by emulating Lovecraft and his brand of cosmic horror, he later specialized in crime and horror stories dealing with the inner workings of the human mind.

Maxwell Maltz (March 10, 1899 – April 7, 1975) was an American cosmetic surgeon and author of Psycho-Cybernetics (1960), which was a system of ideas that he claimed could improve one's self-image. In turn, the person would lead a more successful and fulfilling life. He wrote several books, among which Psycho-Cybernetics was a long-time bestseller — influencing many subsequent self-help teachers. His orientation towards a system of ideas that would provide self help is considered the forerunner of the now popular self help books.

In 1923, Maltz graduated with a doctorate in medicine from the Columbia University College of Physicians and Surgeons.

In 1960, Psycho-Cybernetics: A New Way to Get More Living out of Life was first published by Prentice-Hall and appeared in a pocket book edition by 1969. The book introduced Maltz's views where a person must have an accurate and positive view of his or her self before setting goals; otherwise he or she will get stuck in a continuing pattern of limiting beliefs. His ideas focus on visualizing one's goals and he believes that self-image is the cornerstone of all the changes that take place in a person. According to Maltz, if one's self-image is unhealthy or faulty — all of his or her efforts will end in failure.

Bret Easton Ellis (born March 7, 1964 in Los Angeles, California) is an American novelist and short story writer. His works have been translated into 27 languages. He was regarded as one of the so-called literary Brat Pack, which also included Tama Janowitz and Jay McInerney. He is a self-proclaimed satirist, whose trademark technique, as a writer, is the expression of extreme acts and opinions in an affectless style. Ellis employs a technique of linking novels with common, recurring characters.

Though Ellis made his debut at 21 with the controversial 1985 bestseller Less Than Zero, a zeitgeist novel about amoral young people in Los Angeles; the work he is most known for is his third novel, 1991's American Psycho. On its release, the literary establishment widely condemned the novel as overly violent and misogynistic; though many petitions to ban the book saw Ellis dropped by Simon & Schuster, the resounding controversy made it a paperback bestseller for Alfred A. Knopf later that year. Four of Ellis' works have been made into films; notably, Less Than Zero was rapidly adapted for screen, and a starkly different Less Than Zero film was released in 1987, and Mary Harron's adaptation of American Psycho was released to predominantly positive reviews in 2000. In later years, Ellis' novels have become increasingly metafictional. 2005's Lunar Park, a pseudo-memoir and ghost story, received positive reviews, and 2010's Imperial Bedrooms, marketed as a sequel to Less Than Zero, continues in this vein.