Stromberg, Roland N.
Prentice-Hall, 1997
Buku Teks
edited by Klaus Gottstein
Campus Verlag , 1992
Buku Teks
Grant, A. J.
Longmans, 1966
Buku Teks
Kitzinger, Uwe W., author
Frederick A. Praeger, 1963
Buku Teks
Harcourt, Brace & World, Inc., 1968
Buku Teks