Whipple, G.M. Manual of mental and physical tests : In Two Parts : A book of directions compiled with special reference of the experimental study of school children in the laboratory of classroom. Part 1: Simpler Processes / By Guy Montrose Whipple, Ph. D. University of Michigan, author of "A guide to high school observation", "Questions in general and educational psychology", "Questions in school hygiene". - 3-rd edition. - Baltimore (USA): Warwick & York, Inc., 1924. - XVI, 367 с.