Palacios Chavez, R., & Rzedowski, J. (1993). Palynological study of the fossil floras of the Lower Miocene and early Middle Miocene of the Pichucalco region, Chiapas, Mexico. Instituto de Ecología, A.C.
Chicago-čujuhus (17. p.)Palacios Chavez, Rodolfo, juo Jerzy Rzedowski. Palynological Study of the Fossil Floras of the Lower Miocene and Early Middle Miocene of the Pichucalco Region, Chiapas, Mexico. Instituto de Ecología, A.C, 1993.
MLA-čujuhus (9. p.)Palacios Chavez, Rodolfo, juo Jerzy Rzedowski. Palynological Study of the Fossil Floras of the Lower Miocene and Early Middle Miocene of the Pichucalco Region, Chiapas, Mexico. Instituto de Ecología, A.C, 1993.
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