Cita APA (7th ed.)
Shimer, H. W., & Shrock, R. R. (1949). Index-Fossils of North America. Wiley; Chapman & Hall.
Cita Chicago (17th ed.)
Shimer, Hervey W., i Robert R. Shrock. Index-Fossils of North America. New York; London: Wiley; Chapman & Hall, 1949.
Cita MLA (9th ed.)
Shimer, Hervey W., i Robert R. Shrock. Index-Fossils of North America. Wiley; Chapman & Hall, 1949.
Atenció: Aquestes cites poden no estar 100% correctes.