Weeks, J. M., Sachse, F., & Prager, C. M. (2009). Maya daykeeping: Three calendars from highland Guatemala. University Press of Colorado.

Weeks, John M., Frauke Sachse, and Christian M. Prager. Maya Daykeeping: Three Calendars from Highland Guatemala. Boulder, Colo.: University Press of Colorado, 2009.

Weeks, John M., et al. Maya Daykeeping: Three Calendars from Highland Guatemala. University Press of Colorado, 2009.