Ackerman, Nathan W.
Basic Books, 1972
Buku Teks
Keith, David V., author
Taylor & Francis Inc, 2001
Buku Teks
Dyere, Everett D., author
McGraw-Hill, 1979
Buku Teks
edited by Maureen Baker
McGraw-Hill Ryerson, 1984
Buku Teks
Menski, Werner F., author
Curzon Press, 2001
Buku Teks