APA-referens (7:e uppl.)

Betts, E. A., Esterer, L. A., & Betts, E. A. (1947). Directed spelling activities. American Book Co..

Chicago-referens (17:e uppl.)

Betts, Emmett A., Louise A. Esterer, och Emmett Albert Betts. Directed Spelling Activities. [New York ; Cincinnati]: American Book Co., 1947.

MLA-referens (8:e uppl.)

Betts, Emmett A., et al. Directed Spelling Activities. American Book Co., 1947.