The Pennsylvania State University, University Park*Sharer, Robert J. and David W. Sedat (1987) "Archaeological Investigations in the Northern Maya Highlands, Guatemala: Interaction and the Development of Maya Civilization".
The Pennsylvania State University, University Park* Sharer, Robert J. and David W. Sedat (1987) "Archaeological Investigations in the Northern Maya Highlands, Guatemala: Interaction and the Development of Maya Civilization".