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
Allen, Moyra
World Health Organization, 1977
Buku Teks SO
edited by Ernest R. House
Academic Press, 1986
Buku Teks
edited by David M. Fetterman
Sage, 1984
Buku Teks