APA (7th ed.) Citation

Skilling, W. T., & Richardson, R. S. (1947). Astronomy (Rev. ed.). H. Holt.

Chicago Style (17th ed.) Citation

Skilling, William T., and Robert S. Richardson. Astronomy. Rev. ed. New York: H. Holt, 1947.

MLA (9th ed.) Citation

Skilling, William T., and Robert S. Richardson. Astronomy. Rev. ed. H. Holt, 1947.