Eko, E. E. (1999). Effective writing. Heinemann Educational Books.
Chicago-čujuhus (17. p.)Eko, Ebele E. Effective Writing. Heinemann Educational Books, 1999.
MLA-čujuhus (9. p.)Eko, Ebele E. Effective Writing. Heinemann Educational Books, 1999.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.