Gaya APA

Bowker, R. (1971). Subject Guide To Hardbounds, Paperbacks, Trade Books, Textbooks, Adult Books Juveniles... . New York: R.R Bowker Company.

Gaya MLA

Bowker, R.R.. "Subject Guide To Hardbounds, Paperbacks, Trade Books, Textbooks, Adult Books Juveniles...". New York: R.R Bowker Company, 1971. Text.