APA (7th ed.) Citation

Nelson, S. A., & Sánchez-Rubio, G. (1986). Trans Mexican Volcanic Belt field guide. [publisher not identified].

Chicago Style (17th ed.) Citation

Nelson, Stephen A., and Gerardo Sánchez-Rubio. Trans Mexican Volcanic Belt Field Guide. [Place of publication not identified]: [publisher not identified], 1986.

MLA (9th ed.) Citation

Nelson, Stephen A., and Gerardo Sánchez-Rubio. Trans Mexican Volcanic Belt Field Guide. [publisher not identified], 1986.