APA (7th ed.) Citation

Theissing, H. H., & Caplan, P. J. (1966). Spectroscopic calculations for a multielectron ion. Interscience Publishers.

Chicago Style (17th ed.) Citation

Theissing, H. H., and P. J. Caplan. Spectroscopic Calculations for a Multielectron Ion. New York: Interscience Publishers, 1966.

MLA (8th ed.) Citation

Theissing, H. H., and P. J. Caplan. Spectroscopic Calculations for a Multielectron Ion. Interscience Publishers, 1966.