Ferree, T., & Sanabria, K. (1998). NorthStar: Focus on listening and speaking, high intermediate. Longman.
Chicago-čujuhus (17. p.)Ferree, Tess, juo Kim Sanabria. NorthStar: Focus on Listening and Speaking, High Intermediate. Nueva York: Longman, 1998.
MLA-čujuhus (9. p.)Ferree, Tess, juo Kim Sanabria. NorthStar: Focus on Listening and Speaking, High Intermediate. Longman, 1998.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.