APA (7th ed.) Citation

Heading, J. (1962). An introduction to phase-integral methods. Methuen; Wiley.

Chicago Style (17th ed.) Citation

Heading, John. An Introduction to Phase-integral Methods. London : New York: Methuen; Wiley, 1962.

MLA (9th ed.) Citation

Heading, John. An Introduction to Phase-integral Methods. Methuen; Wiley, 1962.