Ferguson, George Andrew
Statistical analysis in psychology and education
McGraw-Hill , 1981
 Buku Teks
Ferguson, George Andrew
Statistical analysis in psychology and education
McGraw-Hill , 1989
 Buku Teks
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