Routledge, 2018
Buku Teks SO
Robert W. Hefner, editor
Routledge, Taylor & Francis Group, 2018
Buku Teks
edited by Patrick Daly and Tim Winter
Routledge, 2012
Buku Teks SO
Routledge, 2013
Buku Teks SO
edited by Stefan Gossling, C. Michael Hall and Daniel Scott
Routledge, 2015
Buku Teks SO