BLUMENTHAL, J. C. (1973). English 2600: A programed course in grammar and usage.-- Ed. 4. Harcourt Brace Jovanovich.
Chicago-čujuhus (17. p.)BLUMENTHAL, Joseph C. English 2600: A Programed Course in Grammar and Usage.-- Ed. 4. New York: Harcourt Brace Jovanovich, 1973.
MLA-čujuhus (9. p.)BLUMENTHAL, Joseph C. English 2600: A Programed Course in Grammar and Usage.-- Ed. 4. Harcourt Brace Jovanovich, 1973.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.