Herbert A. Thelen

Sound-Recording Processes and Equipment for Educational Purposes

Ned A. Flanders, Herbert A. Thelen, 1950, The School Review.

Group Dynamics in Instruction: Principle of Least Group Size

Herbert A. Thelen, H. Thelen, 1949, The School Review.

Testing by Means of Film Slides with Synchronized Recorded Sound

Herbert A. Thelen, H. Thelen, 1945 .