APA استشهاد

Romer, A. (1971). Vertibrate paleontology (3rd ed.). University of Chicago Press.

استشهاد بنمط شيكاغو

Romer, Alfred. Vertibrate Paleontology. 3rd ed. Chicogo: University of Chicago Press, 1971.

MLA استشهاد

Romer, Alfred. Vertibrate Paleontology. 3rd ed. University of Chicago Press, 1971.