Elliot, Alfred M., author
Burgess Publishing Comp., 1974
Buku Teks
Moment, Grindner B., author
Houghton Miffiln, 1967
Buku Teks
Shellhammer, H. S., author
The National Press, 1965
Buku Teks
Mas Noerdjito, Ibnu Maryanto, editor
USAID, 2001
Buku Teks
Tanner, James T., author
Burgess Publishing, 1970
Buku Teks