APA (7th ed.) Citation

Durr, W. K., Windley, V. O., & Earnhardt, K. S. (1973). Galaxies. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Durr, William Kirtley, Vivian O. Windley, and Kay S. Earnhardt. Galaxies. Boston: Houghton Mifflin, 1973.

MLA (9th ed.) Citation

Durr, William Kirtley, et al. Galaxies. Houghton Mifflin, 1973.