Challenges facing nurses' associations and unions a global perspective
 Artikel Jurnal
Global change and challenge : geography for the 1990s
edited by Robert Bennet and Robert Estall
Routledge, 1991
 Buku Teks SO
The Rise of China: Challenges and Opportunities for Indonesia and ASEAN
 Artikel Jurnal
Zheng, Ping
China?s geography
China Intercontinental Press, 2010
 Buku Teks
Coping with global environmental change, disasters and security : threats, challenges, vulnerabilities and risks
Hans Gunter Brauch ... [et al.], editors ; with forewords by Achim Steiner ... [et al.] ; with preface essays by Paul C. Crutzen ... [et al.].
Springer, 2011
 Buku Teks