Encyclopedia of educational research; Volume 3
editor-in-chief, Harold E. Mitzel
Free Press, 1993
 Buku Referensi
Encyclopedia of educational research; Volume 3
editor-in-chief, Marvin C. Alkin
MacMillan Library Reference USA, 1992
 Buku Referensi
Encyclopedia of educational research; Volume 2
editor-in-chief, Harold E. Mitzel
Free Press, 1993
 Buku Referensi
Encyclopedia of the future : volume 1
edited by George Thomas Kurian, Graham T.T. Molitor
Macmillan Library Reference USA, 1996
 Buku Referensi
The Encyclopedia Americana : volume 1
Americana Corporation, 1977
 Buku Referensi
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