Hans G. Jellen

Helping Students Develop Investigative, Problem Solving, and Thinking Skills in a Cooperative Setting: A Handbook for Teachers, Administrators and Curriculum Workers  John R., Jr Verduin Hans G. Jellen Hardcover. Charles C Thomas Pub Ltd, 1996-10-01 ISBN 9780398066031     Handbook for Differential Education of the Gifted: A Taxonomy of 32 Key Concepts  Hans G. Jellen John R., Jr. Verduin Hardcover. Southern Illinois University Press, 1986-07-01 ISBN 9780809312788