Cita APA (7th ed.)

Xu, G., & Grant, R. E. (1994). Brachiopods near the permian-triassic boundary in South China. Smithsonian Institution.

Cita Chicago (17th ed.)

Xu, Guirong, i Richard E. Grant. Brachiopods Near the Permian-triassic Boundary in South China. Washington, D.C, USA: Smithsonian Institution, 1994.

Cita MLA (9th ed.)

Xu, Guirong, i Richard E. Grant. Brachiopods Near the Permian-triassic Boundary in South China. Smithsonian Institution, 1994.