APA (7th ed.) Citation

Gibbs, A. K., & Barron, C. N. (1993). The geology of the Guiana Shield. Oxford University Press.

Chicago Style (17th ed.) Citation

Gibbs, A. K., and C. N. Barron. The Geology of the Guiana Shield. New York: Oxford University Press, 1993.

MLA (9th ed.) Citation

Gibbs, A. K., and C. N. Barron. The Geology of the Guiana Shield. Oxford University Press, 1993.