Stanley, Julian C., author
Prentice-Hall, 1972
Buku Teks
Nunnally, Jum C., author
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, author
World Health Organization, 1977
Buku Teks
edited by Ernest R. House
Academic Press, 1986
Buku Teks