Charles D. Gilbert

An Examination of Readability Levels for Selected Basic Science Texts.

Charles D. Gilbert, 1973 .

Problem-Solving Behavior of First Grade Children From Differing Socio-Economic Backgrounds.

W. Mortenson, Charles D. Gilbert, 1973 .

A Study of the Interrelationship of Factors Affecting Sixth Grade Students in Respect to Mathematics

Charles D. Gilbert, 1977 .