Gasster, Michael
University of Washington, 1969
Buku Teks
Berman, Harold J., author
The Fondation Press , 1966
Buku Teks
Leenders, Michiel R.
IRWIN, 1997
Buku Teks
Wallace, Harold R.
South-Western Educational, 1995
Buku Teks
University of Tokyo Press, 1984
Buku Teks