Whether you are using a print copy of a book or looking it up on Google Books, citations generally must be done in a certain way for use in academic papers. In general, there are two types of citations that you will need: in-text citations and a bibliography citation.
An in-text citation is placed in parentheses to show the source of a quote or piece of information, giving the author's last name and the page numbers that the citation refers to. The only exception to this format occurs when the author's last name appeared in the text just before the citation was given; in this case, you may cite the author by placing the appropriate page numbers only. An example of this form of citation would be:
Bibliography citations are longer citations which are placed within the bibliography section or page of the academic work. These citations use a different format, being listed in alphabetical order by the author's last name. The author's name is given first, followed by a period, after which the title of the book or article being cited is given (again followed by a period.) The city of publication is listed next, followed by a colon, after which the publisher is listed and followed by a comma. The year of publication is the past portion of the citation, with a period following it. An example of this form of citation would be:
Dickens, Josef. The Big Book of Josef Dickens Quotes. New York: Josef Dickens Press, 1981.