APA (7th ed.) Citation

Otis, C. H. (1931). Michigan trees: A handbook of the native and most important introduced species. The Regents.

Chicago Style (17th ed.) Citation

Otis, Charles Herbert. Michigan Trees: A Handbook of the Native and Most Important Introduced Species. Ann Arbor: The Regents, 1931.

MLA (9th ed.) Citation

Otis, Charles Herbert. Michigan Trees: A Handbook of the Native and Most Important Introduced Species. The Regents, 1931.