APA-viite

Shrock, R. R. T. (1953). Principles of invertebrate paleontology (2.). McGrawhill.

Chicago-tyylinen lähdeviittaus

Shrock, Robert R Twenhofel. Principles of Invertebrate Paleontology. 2. NY: McGrawhill, 1953.

MLA-viite

Shrock, Robert R Twenhofel. Principles of Invertebrate Paleontology. 2. McGrawhill, 1953.