Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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