APA (7th ed.) Citation

Apel, P. H. (1958). The message of music. Vantage Press.

Chicago Style (17th ed.) Citation

Apel, Paul Hermann. The Message of Music. New York: Vantage Press, 1958.

MLA (9th ed.) Citation

Apel, Paul Hermann. The Message of Music. Vantage Press, 1958.