APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Smart, William Marshall, and Robin Michael Green. Textbook on Spherical Astronomy. 6th ed. revised by R.M. Green Cambridge: Cambridge University, 1977.

MLA (9th ed.) Citation

Smart, William Marshall, and Robin Michael Green. Textbook on Spherical Astronomy. 6th ed. Cambridge University, 1977.