Dressel, P. L., & Thompson, M. M. (1973). Independent study. Jossey-Bass.
Chicago-čujuhus (17. p.)Dressel, Paul L., juo Mary M. Thompson. Independent Study. San Francisco: Jossey-Bass, 1973.
MLA-čujuhus (9. p.)Dressel, Paul L., juo Mary M. Thompson. Independent Study. Jossey-Bass, 1973.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.