Pinker, Steven, author
Penguin books, 1994
Buku Teks
Leaf, Murray J.
Columbia University Press, 1979
Buku Teks
Humprey, Nicholas
New York Springer-Verlag , 1999
Buku Teks
East-West Culture Learning Institute, 1980
Buku Teks
edited by Janet l. Nicol
Blackwell , 2006
Buku Teks