López-Portillo, J., Ezcurra, E., & Maass, J. M. (1989). The petenes of Sian Ka'an, Quintana Roo and their relationship with water pressure gradients. Instituto de Ecología, A.C.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)López-Portillo, Jorge, Exequiel Ezcurra, và José Manuel Maass. The Petenes of Sian Ka'an, Quintana Roo and Their Relationship with Water Pressure Gradients. Instituto de Ecología, A.C, 1989.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)López-Portillo, Jorge, et al. The Petenes of Sian Ka'an, Quintana Roo and Their Relationship with Water Pressure Gradients. Instituto de Ecología, A.C, 1989.