Encyclopedia of educational research : a project of the American Educational Research Association /
ed. Robert L. Ebel, Victor H. Noll, Roger M. Bauer.
- 4th ed.
- London : Toronto : The Macmillan Company ; Collier-Macmillan Limited, cop. 1969.
- XLIV, [2], 1522 s. ; 28 cm.
Indeks (s. XXXI-XLIV) umieszczony pomiędzy s. 770-771.