Encyclopedia of educational research : fifth edition, volume 4
Harold E. Mitzel, editor-in-chief
Free Press, 1993
 Buku Referensi
Encyclopedia of educational research : sixth edition, volume 4
Marvin C. Alkin, editor-in-chief
MacMillan Library Reference USA, 1992
 Buku Referensi
Encyclopedia of educational research : sixth edition, volume 1
Marvin C. Alkin, editor-in-chief
MacMillan Library Reference USA, 1992
 Buku Referensi
Encyclopedia of educational research : sixth edition, volume 2
Marvin C. Alkin, editor-in-chief
MacMillan Library Reference USA, 1992
 Buku Referensi
Encyclopedia of knowledge : volume 4
Grolier Incorporated, 1991
 Buku Referensi
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