Thomas Guderjan and C. Colleen Hanratty. Factors of Stress and Processes Leading to the end of the Classic Period at Blue Creek, Research Reports in Belizean Archaeology 4:155-165. Maya Research Program

https://www.academia.edu/2132879/Thomas_Guderjan_and_C_Colleen_Hanratty_Factors_of_Stress_and_Processes_Leading_to_the_end_of_the_Classic_Period_at_Blue_Creek_Research_Reports_in_Belizean_Archaeology_4_155_165&nav_from=c091436b-2fea-4eef-864b-6cec6aba4c59&rw_pos=0