Anthony, P., & Margroff, R. E. (1990). Orc's opal. Tor Books.
Chicago Style (17th ed.) CitationAnthony, Piers, and Robert E. Margroff. Orc's Opal. New York: Tor Books, 1990.
MLA (9th ed.) CitationAnthony, Piers, and Robert E. Margroff. Orc's Opal. Tor Books, 1990.
Warning: These citations may not always be 100% accurate.