Crystal, D. (1997). English as a global language. Univ. Pr.
Chicago-čujuhus (17. p.)Crystal, David. English as a Global Language. Cam.: Univ. Pr, 1997.
MLA-čujuhus (9. p.)Crystal, David. English as a Global Language. Univ. Pr, 1997.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.