APA (7th ed.) Citation

Comstock, G. C. (1901). A text-book of astronomy. D. Appleton and company.

Chicago Style (17th ed.) Citation

Comstock, George C. A Text-book of Astronomy. New York: D. Appleton and company, 1901.

MLA (8th ed.) Citation

Comstock, George C. A Text-book of Astronomy. D. Appleton and company, 1901.