APA (7th ed.) Citation

Heitler, W. (1949). The quantum theory of radiation (2. ed., reprint.). Oxford Univ. Press.

Chicago Style (17th ed.) Citation

Heitler, Walter. The Quantum Theory of Radiation. 2. ed., reprint. Oxford: Oxford Univ. Press, 1949.

MLA (9th ed.) Citation

Heitler, Walter. The Quantum Theory of Radiation. 2. ed., reprint. Oxford Univ. Press, 1949.