Stromberg, Roland D.
Appleton-Century-Crofts, 1968
Buku Teks
Stromberg, Roland N.
Prentice-Hall, 1990
Buku Teks
Hughes, H. Stuart
Alfred A. Knopf, 1961
Buku Teks
edited by John R. Burr
Greenwood Press, 1980
Buku Referensi
edited by K. Michael Hays
MIT Press, 1998
Buku Teks