APA (7th ed.) Citation

Bell, P., & Wrigth, D. (1987). Rocas y minerales. Omega.

Chicago Style (17th ed.) Citation

Bell, Pat, and David Wrigth. Rocas Y Minerales. Barcelona: Omega, 1987.

MLA (9th ed.) Citation

Bell, Pat, and David Wrigth. Rocas Y Minerales. Omega, 1987.