Encyclopedia of educational research; Volume 3
editor-in-chief, Harold E. Mitzel
Free Press, 1993
 Buku Referensi
Encyclopedia of educational research; Volume 1
editor-in-chief, Marvin C. Alkin
Macmillan Library Reference, 1992
 Buku Referensi
Encyclopedia of educational research; Volume 2
editor-in-chief, Marvin C. Alkin
Macmillan Library Reference, 1992
 Buku Referensi
Encyclopedia of educational research; Volume 1
editor-in-chief, Harold E. Mitzel
Free Press, 1993
 Buku Referensi
Encyclopedia of educational research; Volume 2
editor-in-chief, Harold E. Mitzel
Free Press, 1993
 Buku Referensi