Costinett, S., & Byrd, D. R. H. (1993). Spectrum 2: A communicative course in English. Student book, 2A (1a. ed.). Regents.
Chicago-čujuhus (17. p.)Costinett, Sandra, juo Donald R. H. Byrd. Spectrum 2: A Communicative Course in English. Student Book, 2A. 1a. ed. Englewood Cliffs: Regents, 1993.
MLA-čujuhus (9. p.)Costinett, Sandra, juo Donald R. H. Byrd. Spectrum 2: A Communicative Course in English. Student Book, 2A. 1a. ed. Regents, 1993.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.