APA (7th ed.) Citation

Dover Publications, Schawlow, A. L., & Townes, C. H. (1975). Microwave spectroscopy. Dover Publications.

Chicago Style (17th ed.) Citation

Dover Publications, A. L. Schawlow, and C. H. Townes. Microwave Spectroscopy. New York: Dover Publications, 1975.

MLA (8th ed.) Citation

Dover Publications, et al. Microwave Spectroscopy. Dover Publications, 1975.