APA (7th ed.) Citation

International Geological Congress Mexico. (1956). Guidebook for excursions A-4 y C-2 (English ed.). [publisher not identified].

Chicago Style (17th ed.) Citation

International Geological Congress Mexico. Guidebook for Excursions A-4 Y C-2. English ed. [Place of publication not identified]: [publisher not identified], 1956.

MLA (9th ed.) Citation

International Geological Congress Mexico. Guidebook for Excursions A-4 Y C-2. English ed. [publisher not identified], 1956.