Alexander, L. G. (1973). Mainline: Progress A, students' book (1a. ed.). Longman.
Chicago-čujuhus (17. p.)Alexander, Louis George. Mainline: Progress A, Students' Book. 1a. ed. Londres: Longman, 1973.
MLA-čujuhus (9. p.)Alexander, Louis George. Mainline: Progress A, Students' Book. 1a. ed. Longman, 1973.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.