APA Citation

Hansen, P. S. (1961). An introduction to twentieth century music. Boston: Allyn and Bacon, Inc..

Chicago Style Citation

Hansen, Peter Sijer. An Introduction to Twentieth Century Music. Boston: Allyn and Bacon, Inc., 1961.

MLA Citation

Hansen, Peter Sijer. An Introduction to Twentieth Century Music. Boston: Allyn and Bacon, Inc., 1961.

Warning: These citations may not always be 100% accurate.