Cita APA (7a ed.)

Moulton, F. R. (1906). An introduction to astronomy. MacMillan Company.

Cita Chicago Style (17a ed.)

Moulton, Forest Ray. An Introduction to Astronomy. New York: MacMillan Company, 1906.

Cita MLA (9a ed.)

Moulton, Forest Ray. An Introduction to Astronomy. MacMillan Company, 1906.