APA (7th ed.) Citation

Allen, R. M. (1999). The game of worlds. Avon Books.

Chicago Style (17th ed.) Citation

Allen, Roger MacBride. The Game of Worlds. New York: Avon Books, 1999.

MLA (9th ed.) Citation

Allen, Roger MacBride. The Game of Worlds. Avon Books, 1999.

Warning: These citations may not always be 100% accurate.