APA (7th ed.) Citation

Heitler, W. (1954). The quantum theory of radiation (3. ed.). Clarendon Press.

Chicago Style (17th ed.) Citation

Heitler, Walter. The Quantum Theory of Radiation. 3. ed. Oxford: Clarendon Press, 1954.

MLA (9th ed.) Citation

Heitler, Walter. The Quantum Theory of Radiation. 3. ed. Clarendon Press, 1954.