Putnam, Tonya L. (Tonya Lee)
Cambridge University Press, 2016
Buku Teks
Sonnevend, Julia
Oxford University Press, 2016
eBooks
Thomas, Heather, 1971-
SLACK Incorporated, 2015
Buku Teks SO
edited by Ong Jin Hui, Chan Kwok Bun, and Chew Soon Beng
Prentince Hall, 1995
Buku Teks SO
Mimi Sheller and Kevin Hannam, editors
Routledge, Taylor & Francis Group, 2018
Buku Teks SO