APA (7th ed.) Citation

Grabau, A. W., & Shimer, H. W. (1909). North American index fossils: Invertebrates. A. G. Seiler & Co..

Chicago Style (17th ed.) Citation

Grabau, Amadeus W., and Hervey Woodburn Shimer. North American Index Fossils: Invertebrates. New York: A. G. Seiler & Co., 1909.

MLA (9th ed.) Citation

Grabau, Amadeus W., and Hervey Woodburn Shimer. North American Index Fossils: Invertebrates. A. G. Seiler & Co., 1909.