Bentley, P.J.
Cambridge University Press, 1982
Buku Teks
Pace, Donald M.
Burgess , 1950
Buku Teks
editor, J. Larry Jameson
McGraw-Hill, 2017
Buku Teks
Turner, C. Donnell, author
Airlangga University Press, 1988
Buku Teks
Hadley, Mac E.
Prentice-Hall, 2007
Buku Teks