Knepler, Henry
Macmillan, 1983
Buku Teks
Kostash, Myrna
Edmonton Hurtig Publishers , 1977
Buku Teks
Russel Sage Foundation, 2004
Buku Teks
Mimi Sheller and Kevin Hannam, editors
Routledge, Taylor & Francis Group, 2018
Buku Teks
edited by Ong Jin Hui, Chan Kwok Bun, and Chew Soon Beng
Prentince Hall, 1995
Buku Teks SO