Juma, Calestous
UN Millenium Project, 2005
Buku Teks SO
edited by Yaakov Weber, Shlomo Y. Tarba
Emerald, 2016
eBooks
edited by Jeffrey Furman, Annabelle Gawer, Brian S. Silverman, Scott Stern
Emerald, 2017
eBooks
by Paul Trott ... [and others]
Routledge, 2016
Buku Teks SO
Jose Machado, Filomena Soares, Germano Veiga, editor
Springer, 2019
Buku Teks SO