Ehistler, H. S., & Hummel, H. A. j. a. (1942). First steps in band playing, a class method for all instruments. Rubank.
Lua i Stíl Chicago (17ú heag.)Ehistler, Harvey S., agus Herman A. joint auth Hummel. First Steps in Band Playing, a Class Method for All Instruments. Chicago: Rubank, 1942.
Lua MLA (9ú heag.)Ehistler, Harvey S., agus Herman A. joint auth Hummel. First Steps in Band Playing, a Class Method for All Instruments. Rubank, 1942.
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