Nunnally, Jum C.
McGraw-Hill, 1972
Buku Teks
edited by Robert L. Linn ; sponsored jointly by National Council on Measurement in Education and American Council on Education
New York, 1989
Buku Teks
Brown, Frederick G.
Dryden Press, 1970
Buku Teks
American Psychological Association, 1985
Buku Teks
Allen, Moyra
World Health Organization, 1977
Buku Teks