Sommers, Christina
Harcourt Brace College Pub., 1997
Buku Teks SO
Whiteman, Natasha
Springer, 2012
eBooks
Battaly, Heather D., 1969-
Polity, 2015
Buku Teks SO
Ginan Aulia Rahman
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2018
UI - Skripsi Membership
edited by Geatoid O`Tuathail and Simon Dalby
Routledge, 1998
Buku Teks SO