Seler, E. G. 1., Förstemann, E. W. 1., Schellhas, P. 1., Sapper, K. 1., Dieseldorff, E. P. 1., & Bowditch, C. P. 1. (1904). Mexican and Central American antiquities calendar systems, and history. Washington: Government Printig Office.

Seler, Eduard Georg 1849-1922, Ernst Wilhelm 1822-1906 Förstemann, Paul 1859-1945 Schellhas, Karl 1866-1945 Sapper, Erwin Paul 1868-1940 Dieseldorff, and Charles Pickering 1842-1921 Bowditch. Mexican and Central American Antiquities Calendar Systems, and History. Washington: Government Printig Office, 1904.

Seler, Eduard Georg 1849-1922, et al. Mexican and Central American Antiquities Calendar Systems, and History. Washington: Government Printig Office, 1904.