Roberta J. Vann

Viewpoints U.S.A. : a basic ESL reader

Roberta J. Vann, Vivian P. Hefley, 1984 .

Exploring Speaking-Writing Relationships: Connections and Contrasts.

Barry M. Kroll, Roberta J. Vann, 1985 .

Problems in the Transfer of Agricultural Technology: An ESP Program.

Roberta J. Vann, 1987 .