Hazard, Paul
New American Library, 1963
Buku Teks
Stromberg, Roland D.
Appleton-Century-Crofts, 1968
Buku Teks
Harman, Graham, 1968-, author
Polity Press, 2016
Buku Teks
Stromberg, Roland N.
Prentice-Hall, 1990
Buku Teks
Corvi, Roberta
Routledge, 1997
Buku Teks