APA
Conference of Latin American Geographers, . (1990). Year Book 1990. Texas: University of Texas.
Chicago
Conference of Latin American Geographers, . 1990. Year Book 1990. Texas: University of Texas.
Harvard
Conference of Latin American Geographers, . (1990). Year Book 1990. Texas: University of Texas.
MLA
Conference of Latin American Geographers, . Year Book 1990. Texas: University of Texas. 1990.
