Schultz, Theodore W.
The Minchigan of Univ. Press, 1966
Buku Teks
Tarrant, John R.
John Wiley & Sons, 1980
Buku Teks
edited by Carl Eicher and Lawrence Witt
McGraw-Hill , 1964
Buku Teks
Nakamura, James I., author
Princeton University Press, 1966
Buku Teks
Schultz, Theodore W.
Yale University Press , 1964
Buku Teks