APA (7th ed.) Citation

Duncan, A. B. F. (1971). Rydberg series in atoms and molecules. Academic Press.

Chicago Style (17th ed.) Citation

Duncan, A. B. F. Rydberg Series in Atoms and Molecules. New York: Academic Press, 1971.

MLA (9th ed.) Citation

Duncan, A. B. F. Rydberg Series in Atoms and Molecules. Academic Press, 1971.