Rifkin, Bernard, author
McGraw-Hill, 1979
Buku Teks
Litwack, Leon, author
Prentice-Hall, 1962
Buku Teks
Gould, William B., IV, author
MIT Press, 1982
Buku Teks
Daugherty, Carrol R., author
Houghton Mifflin, 1952
Buku Teks
Bok, Derek C., author
Simon and Schuster, 1969
Buku Teks