Asimov, I. (1973). The Foundation trilogy. Panther Books.
Chicago Style (17th ed.) CitationAsimov, Isaac. The Foundation Trilogy. Frogmore: Panther Books, 1973.
MLA (8th ed.) CitationAsimov, Isaac. The Foundation Trilogy. Panther Books, 1973.
Warning: These citations may not always be 100% accurate.