Moyer, John W.
The Ronald Press Company, 1953
Buku Teks
Palmer, Claude Irwin, author
McGraw-Hill, 1994
Buku Teks
Sharp, H. Oakley
Macmillan, 1951
Buku Teks
Gibson, Stuart W., author
Mac Millan Press , 1994
Buku Teks
Chayen, J., author
John Wiley & Sons, 1972
Buku Teks