Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Richards, W. G., y P. R. Scott. Energy Levels in Atoms and Molecules. Oxford [etc.]: Oxford University Press, 1994.

Cita MLA (9a ed.)

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