Sorum, C. H., author
Prentice-Hall, 1955
Buku Teks
Keenan, Charles W., author
Harper and Row, 1976
Buku Teks
Brady, James E., author
John Wiley & Sons, 1990
Buku Teks
Nekrasov, B., author
Peace, 1965
Buku Teks
Nekrasov, B., author
Peace, [Date of publication not identified]
Buku Teks