The challenge of effective speaking /

Geahča maid

• The challenge of effective speaking /
  Dahkki: Verderber, Rudolph F.
  Almmustuhtton: (1976)
• The challenge of effective speaking /
  Dahkki: Verderber, Rudolph F.
  Almmustuhtton: (1982)
• The challenge of effective speaking /
  Dahkki: Verderber, Rudolph F.
  Almmustuhtton: (1991)
• The challenge of effective speaking /
  Dahkki: Verderber, Rudolph F.
  Almmustuhtton: (1988)
• The challenge of effective speaking /
  Dahkki: Verderber, Rudolph F.
  Almmustuhtton: (1985)