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1
Essentials of informative speaking : theory & contexts / Rudolph F. Verderber.
Belmont, Calif : Wadsworth Pub. Co., c1991
xv, 240 p. ; 24 cm.
2
Essentials of informative speaking : theory & contexts / Rudolph F. Verderber.
Wadsworth: Thomson learing, 2000
xv, 240 p. ; 24 cm.