Miller, Delbert C., author
Longman, 1983
Buku Teks
Adams, William J., author
Xerox College, 1975
Buku Teks
Bierstedt, Robert, author
McGraw-Hill, 1964
Buku Teks
Eisenberg, Leon, author
D. Reidel, 1981
Buku Teks
Phillips, D.C., author
Stanford University Press, 1976
Buku Teks