APA (7th ed.) Citation

Otis, C. H., & Burns, G. P. (2012). Michigan Trees A Handbook of the Native and Most Important Introduced Species. Project Gutenberg.

Chicago Style (17th ed.) Citation

Otis, Charles Herbert, and George Plumer Burns. Michigan Trees A Handbook of the Native and Most Important Introduced Species. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Otis, Charles Herbert, and George Plumer Burns. Michigan Trees A Handbook of the Native and Most Important Introduced Species. Project Gutenberg, 2012.

Warning: These citations may not always be 100% accurate.