Health care ethics: critical issues for the 21st century
edited by Eileen E. Morrison, Beth Furlong
Jones & Bartlett Learning, 2014
 Buku Teks
Developing leaders for positive organizing: a 21st century repertoire for leading in extraordinary times
lead editor, Rob Koonce
Emerald, 2017
 eBooks
Tatum Syarifah Adiningrum
It right : the importance of communication skills to 21st century educational leaders
[Publisher not identified], 2011
 Artikel Jurnal
Huber, Stephan G
Preparing school leaders for the 21st century : an international comparison of development program in 15 countries / Stephan G. Huber
Routledge Falmer, 2004
 Buku Teks
Harding, Alan
Urban theory : a critical introduction to power, cities and urbanism in the 21st century / Alan Harding, Talja Blokland
SAGE, 2014
 Buku Teks