Cita APA (7a ed.)

Shrock, R. R. (1953). Principles of invertebrate paleontology (2a.ed.). McGraw-Will.

Cita Chicago Style (17a ed.)

Shrock, Robert R. Principles of Invertebrate Paleontology. 2a.ed. Nueva York: McGraw-Will, 1953.

Cita MLA (8a ed.)

Shrock, Robert R. Principles of Invertebrate Paleontology. 2a.ed. McGraw-Will, 1953.