Citazione Stile APA (7a Edizione)

Herfurth, C. P. (1942). A tune a day: A first book for clarinet instruction. Boston Music.

Citazione stile Chigago Style (17a edizione)

Herfurth, Clarence Paul. A Tune a Day: A First Book for Clarinet Instruction. Boston: Boston Music, 1942.

Citatione MLA (9a ed.)

Herfurth, Clarence Paul. A Tune a Day: A First Book for Clarinet Instruction. Boston Music, 1942.