APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Richards, W. G. Energy Levels in Atoms and Molecules. Oxford , Eng: Oxford University Press, 1994.

MLA (9th ed.) Citation

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