Sante, Daniel P., author
Prentice-Hall, 1980
Buku Teks
Weyrick, Robert C., author
McGraw-Hill Kogakusha, 1975
Buku Teks
Eckman, Donald P., author
John Wiley & Sons, 1961
Buku Teks
White, Fred
Edward Arnold, 1995
Buku Teks
Bryan, G. T.
Hodder and Stoughton, 1977
Buku Teks