APA (7th ed.) Citation

Proctor, M. (1926). The romance of comets. Harper and Brothers Publishers.

Chicago Style (17th ed.) Citation

Proctor, Mary. The Romance of Comets. New York: Harper and Brothers Publishers, 1926.

MLA (9th ed.) Citation

Proctor, Mary. The Romance of Comets. Harper and Brothers Publishers, 1926.

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