APA (7th ed.) Citation

Hosmer, G. L., & Robbins, J. M. (1948). Practical astronomy: A textbook for engineering schools and a manual of field methods (4th ed.). J. Wiley.

Chicago Style (17th ed.) Citation

Hosmer, George L., and James M. Robbins. Practical Astronomy: A Textbook for Engineering Schools and a Manual of Field Methods. 4th ed. New York: J. Wiley, 1948.

MLA (9th ed.) Citation

Hosmer, George L., and James M. Robbins. Practical Astronomy: A Textbook for Engineering Schools and a Manual of Field Methods. 4th ed. J. Wiley, 1948.