Asimov, I. (2016). Foundation and empire (NA.). Harper Voyager.
Chicago Style (17th ed.) CitationAsimov, Isaac. Foundation and Empire. NA. London: Harper Voyager, 2016.
MLA (9th ed.) CitationAsimov, Isaac. Foundation and Empire. NA. Harper Voyager, 2016.
Warning: These citations may not always be 100% accurate.