Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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