Hartley, Peter, 1946-, author
Routledge, 1997
Buku Teks
editor, Lawrence R. Frey
Sage, 2002
Buku Teks
Harris, Thomas E., author
Pearson, 2011
Buku Teks
Fisher, B. Aubrey, 1937-, author
McGraw-Hill, 1980
Buku Teks
Ellis, Donald G., author
McGraw-Hill, 1994
Buku Teks