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The Collins Dictionary defines a book as, "A book is a number of pieces of paper, usually with words printed on them, which are fastened together and fixed inside a cover of stronger paper or cardboard. Books contain information."
In an academic context many times books will contain in-text citations and a reference list. Books with edited chapters will often contain in-text citations and a reference list for each chapter.
Books can be in print or in electronic form (more commonly known as ebooks).