Henderson, H. James, author
McGraw-Hill, 1974
Buku Teks
Washington: LCSH, 1994,
Buku Referensi
Franck, Thomas M., author
Oxford University Press, 1979
Buku Teks
Morris S.Ogul
Prentice-Hall, 1977
Buku Teks
Howard D.Samuel
Henry Holt and Company, 1953
Buku Teks