Drummond, G. (1972). English structure practice. Longman.
Chicago-čujuhus (17. p.)Drummond, Gordon. English Structure Practice. London: Longman, 1972.
MLA-čujuhus (9. p.)Drummond, Gordon. English Structure Practice. Longman, 1972.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.