APA-čujuhus (7. p.)
Verderber, R. F. (1976). The challenge of effective speaking (3rd ed.). Wadsworth.
Chicago-čujuhus (17. p.)
Verderber, Rudolph F. The Challenge of Effective Speaking. 3rd ed. Califonia: Wadsworth, 1976.
MLA-čujuhus (9. p.)
Verderber, Rudolph F. The Challenge of Effective Speaking. 3rd ed. Wadsworth, 1976.
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