APA-viite (7. p.)

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.

Chicago-viite (17. p.)

López-Portillo, Jorge, Exequiel Ezcurra, ja José Manuel Maass. The Petenes of Sian Ka'an, Quintana Roo and Their Relationship with Water Pressure Gradients. Instituto de Ecología, A.C, 1989.

MLA-viite (9. p.)

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.