Luchins, Abraham S., author
Holt, Rinehart and Winston, 1965
Buku Teks
by Anthony L. Peressini [and others]
The University of Chicago, 1989
Buku Teks
Kolman, Bernard, 1932-, author
Prentice-Hall, 1987
Buku Teks
Batschelet, Edward
Springer-Verlag , 1975
Buku Teks
Lipschutz, Seymour, 1915-2003, author
McGraw-Hill, 1976
Buku Teks