Cita APA (7a ed.)

Alfaro, M. B., Uriz, N. J., Cingolani, C. A., Tortello, M. F., Bidone, A. R., & Galeano Inchausti, J. C. (2012). Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, eastern Paraguay.

Cita Chicago Style (17a ed.)

Alfaro, Marta Beatríz, Norberto Javier Uriz, Carlos Alberto Cingolani, Marcelo Franco Tortello, Andrea Rosa Bidone, y J. C. Galeano Inchausti. Graptolites and Trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, Eastern Paraguay. 2012.

Cita MLA (8a ed.)

Alfaro, Marta Beatríz, et al. Graptolites and Trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, Eastern Paraguay. 2012.