Keith-Lucas, A. (1972). Giving and taking help. University of North Carolina.
Chicago-čujuhus (17. p.)Keith-Lucas, Alan. Giving and Taking Help. Chapel hill: University of North Carolina, 1972.
MLA-čujuhus (9. p.)Keith-Lucas, Alan. Giving and Taking Help. University of North Carolina, 1972.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.