Stone, L. (1969). Lower Cambridge english exercies. Macmillan.
Chicago-čujuhus (17. p.)Stone, Linton. Lower Cambridge English Exercies. London: Macmillan, 1969.
MLA-čujuhus (9. p.)Stone, Linton. Lower Cambridge English Exercies. Macmillan, 1969.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.