APA (7th ed.) Citation

Smart, W. M., & Green, R. M. (1977). Textbook on spherical astronomy (6th ed.). Cambridge University Press.

Chicago Style (17th ed.) Citation

Smart, W. M., and Robin Michael Green. Textbook on Spherical Astronomy. 6th ed. Cambridge ; New York: Cambridge University Press, 1977.

MLA (9th ed.) Citation

Smart, W. M., and Robin Michael Green. Textbook on Spherical Astronomy. 6th ed. Cambridge University Press, 1977.