APA (7th ed.) Citation

Simons, L. (1955). Calculation of energy levels of the valence electron in sodium.

Chicago Style (17th ed.) Citation

Simons, Lennart. Calculation of Energy Levels of the Valence Electron in Sodium. Helsingfors, 1955.

MLA (9th ed.) Citation

Simons, Lennart. Calculation of Energy Levels of the Valence Electron in Sodium. 1955.

Warning: These citations may not always be 100% accurate.