APA-čujuhus (7. p.)
Verderber, R. F. (1988). The challenge of effective speaking (7th ed.). Wadsworth Pub. Co..
Chicago-čujuhus (17. p.)
Verderber, Rudolph F. The Challenge of Effective Speaking. 7th ed. Belmont, Calif.: Wadsworth Pub. Co., 1988.
MLA-čujuhus (9. p.)
Verderber, Rudolph F. The Challenge of Effective Speaking. 7th ed. Wadsworth Pub. Co., 1988.
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