Educational research :
Educational research : Readings in focus /
edited by Irvin J Lehmann, William A Mehrens.
- New York : Holt, Rinehart and Winston Inc., c1971
- xiii, 460 p. ; 23 cm.
0030831407
Education --Research.
370.78 / EDU
0030831407
Education --Research.
370.78 / EDU