APA (7th ed.) Citation

Kuhn, H. G. (1971). Atomic spectra (2. ed., new impression.). Longman.

Chicago Style (17th ed.) Citation

Kuhn, Heinrich G. Atomic Spectra. 2. ed., new impression. London: Longman, 1971.

MLA (9th ed.) Citation

Kuhn, Heinrich G. Atomic Spectra. 2. ed., new impression. Longman, 1971.