Cita APA (7th ed.)

Richards, W. (1994). Energy levels in atoms and molecules. Oxford Univ. Pr..

Cita Chicago (17th ed.)

Richards, W.G. Energy Levels in Atoms and Molecules. Oxford: Oxford Univ. Pr., 1994.

Cita MLA (9th ed.)

Richards, W.G. Energy Levels in Atoms and Molecules. Oxford Univ. Pr., 1994.