Graver, B. D. (1971). Advanced english practice (2a. ed.). Oxford University Press.
Chicago-čujuhus (17. p.)Graver, B. D. Advanced English Practice. 2a. ed. Oxford: Oxford University Press, 1971.
MLA-čujuhus (9. p.)Graver, B. D. Advanced English Practice. 2a. ed. Oxford University Press, 1971.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.