APA (7th ed.) Citation

Richards, W. G., & Scott, P. R. (1994). Energy levels in atoms and molecules. Oxford University Press.

Chicago Style (17th ed.) Citation

Richards, W. G., and P. R. Scott. Energy Levels in Atoms and Molecules. Oxford ; New York: Oxford University Press, 1994.

MLA (9th ed.) Citation

Richards, W. G., and P. R. Scott. Energy Levels in Atoms and Molecules. Oxford University Press, 1994.