APA (7th ed.) Citation

Grabau, A. W., & Shimer, H. W. (1910). North american index fossils. Invertebrates. A. G. Seiler.

Chicago Style (17th ed.) Citation

Grabau, Amadeus W., and Hervey Woodburn Shimer. North American Index Fossils. Invertebrates. Nueva York: A. G. Seiler, 1910.

MLA (9th ed.) Citation

Grabau, Amadeus W., and Hervey Woodburn Shimer. North American Index Fossils. Invertebrates. A. G. Seiler, 1910.