APA (7th ed.) Citation

Hellmuth, N. M. (1978). Tikal, Copan travel guide: A complete guide to all the ruins of Central America. [publisher not identified].

Chicago Style (17th ed.) Citation

Hellmuth, Nicholas M. Tikal, Copan Travel Guide: A Complete Guide to All the Ruins of Central America. [Guatemala City?]: [publisher not identified], 1978.

MLA (9th ed.) Citation

Hellmuth, Nicholas M. Tikal, Copan Travel Guide: A Complete Guide to All the Ruins of Central America. [publisher not identified], 1978.