Ranney, Austin, author
Harcourt, Brace and Company, 1956
Buku Teks
Bone, Hugh A., author
McGraw-Hill, 1965
Buku Teks
Greenstein, Fred I., author
Englewood Cliffs, 1970
Buku Teks
Patterson, Thomas E., author
McGraw-Hill, 203
Buku Teks
Scalapino, Robert A., author
University of California Press, 1953
Buku Teks