Palmer, Axel, author
Routledge, 2018
Buku Teks
Mars, Gerald
Brookfield Dartmouth , 1994
Buku Teks
Slapper, Gary, author
Longman , 1999
Buku Teks
edited by Robert N. Lehrer
McGraw-Hill, 1983
Buku Teks
Muhammad Mustofa, author
Kencana Prenada Media Group, 2010
Buku Teks