APA (7th ed.) Citation

Campbell, K., & Simbalist, E. E. (1985). Space opera. Fantasy Games Unlimited.

Chicago Style (17th ed.) Citation

Campbell, Ken, and Edward E. Simbalist. Space Opera. Roslyn, N.Y.: Fantasy Games Unlimited, 1985.

MLA (9th ed.) Citation

Campbell, Ken, and Edward E. Simbalist. Space Opera. Fantasy Games Unlimited, 1985.