Langan, J. (1988). English skills with readings (3rd ed.). McGraw hill.
Chicago-čujuhus (17. p.)Langan, John. English Skills with Readings. 3rd ed. New York: McGraw hill, 1988.
MLA-čujuhus (9. p.)Langan, John. English Skills with Readings. 3rd ed. McGraw hill, 1988.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.