Cita APA

Guensburg, T. E., & Waisfeld, B. G. (2015). South America’s earliest (Ordovician, Floian) crinoids. Web

Citación estilo Chicago

Guensburg, Thomas E., and Beatriz Graciela Waisfeld. South America’s Earliest (Ordovician, Floian) Crinoids. 2015.

Cita MLA

Guensburg, Thomas E., and Beatriz Graciela Waisfeld. South America’s Earliest (Ordovician, Floian) Crinoids. 2015.

Precaución: Estas citas no son 100% exactas.