Cressey, George Babcock, 1896-1963, author
Whittlesey house, McGraw-Hill book company inc., 1944
Buku Teks
Cressey, George Babcock, 1896-1963, author
McGraw-Hill, 1951
Buku Teks
Princeton University Press, 1984
Buku Teks
Charles E. Tuttle Co., 1969
Buku Teks
Duke University Press, 1970
Buku Teks