Richards, W. (1994). Energy levels in atoms and molecules. Oxford Univ. Pr..
Chicago-čujuhus (17. p.)Richards, W.G. Energy Levels in Atoms and Molecules. Oxford: Oxford Univ. Pr., 1994.
MLA-čujuhus (9. p.)Richards, W.G. Energy Levels in Atoms and Molecules. Oxford Univ. Pr., 1994.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.