APA استشهاد

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

استشهاد بنمط شيكاغو

Heading, John. An Introduction to Phase-integral Methods. London: Methuen, 1962.

MLA استشهاد

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