Willis, H. (1971). Basic usage, vocabulary, and composition. Holt Rinehart and Winston.
Chicago-čujuhus (17. p.)Willis, Hulon. Basic Usage, Vocabulary, and Composition. New York: Holt Rinehart and Winston, 1971.
MLA-čujuhus (9. p.)Willis, Hulon. Basic Usage, Vocabulary, and Composition. Holt Rinehart and Winston, 1971.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.