Medin, Douglas L., author
Harcourt Brace Jovanovich College, 1991
Buku Teks
Kolb, Brayn, author
Amazon, 2005
Buku Teks
Staats, Arthur W.
Holt, Rinehart and Winston, 1964
Buku Teks
Blackburn, Julian, author
Kegan Paul, Trench, Trubner, 1947
Buku Teks
Blackburn, Julian, author
Routledge & Kegan Paul, 1953
Buku Teks