Cita APA (7a ed.)

Westergaard, P. (1975). An introduction to tonal theory. Norton.

Cita Chicago Style (17a ed.)

Westergaard, Peter. An Introduction to Tonal Theory. New York: Norton, 1975.

Cita MLA (9a ed.)

Westergaard, Peter. An Introduction to Tonal Theory. Norton, 1975.