Cita APA (7a ed.)

Zhang, Y., & Lenz, A. C. (1998). Early Devonian graptolites from Southwest Yunnan, China.

Cita Chicago Style (17a ed.)

Zhang, Yuan-Dong, y Alfred C. Lenz. Early Devonian Graptolites from Southwest Yunnan, China. 1998.

Cita MLA (8a ed.)

Zhang, Yuan-Dong, y Alfred C. Lenz. Early Devonian Graptolites from Southwest Yunnan, China. 1998.