Henry, Gary T.

Practical sampling / by: Henry, Gary T. (Language materials, printed)

Evaluation : = a systematic approach / by: Rossi, Peter H. (1921-2006.); Henry, Gary T.; Lipsey, Mark W. (Language materials, printed)

Evaluation : = an integrated framework for understanding, guiding, and improving policies and programs / by: Henry, Gary T.; Julnes, George, (1954-); Mark, Melvin M. (Language materials, printed)

Graphing data : = techniques for display and analysis / by: Henry, Gary T. (Language materials, printed)