Cite

Ku Klux blues / by Al Mars and Clarence Krause.

MLA

Krause, Clarence. Ku Klux Blues / by Al Mars and Clarence Krause. Krause & Mars, 1921. https://collections.library.yale.edu/catalog/2012003.

APA, 6th edition

Krause, C. (1921). Ku Klux blues / by Al Mars and Clarence Krause. [Publishers' advertisements--Georgia--Thomasville--1921., Publishers' advertisements--Texas--Dallas--1921., Sheet music.]. Krause & Mars, https://collections.library.yale.edu/catalog/2012003.