Anderson, R. C. (1991). Cicles of influence. Moody.
Chicago-čujuhus (17. p.)Anderson, Robert C. Cicles of Influence. Chicago: Moody, 1991.
MLA-čujuhus (9. p.)Anderson, Robert C. Cicles of Influence. Moody, 1991.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.