Holbrook, D. (1961). English for maturity. Univ. Press.
Chicago-čujuhus (17. p.)Holbrook, David. English for Maturity. Cambridge: Univ. Press, 1961.
MLA-čujuhus (9. p.)Holbrook, David. English for Maturity. Univ. Press, 1961.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.