Cressey, Geoge Babcock, author
McGraw-Hill, 1934
Buku Teks
Berndt, Ronald M., author
University Microfilms International, 1954
Buku Teks
Winfield, Gerald F.
William Sloane Associates, Inc., 1948
Buku Teks
Shao-Chuan Leng
Oceana Publications,Inc, 1967
Buku Teks
Chen, Kenneth K.S., author
Princeton Un iversity Press, 1964
Buku Teks