Harrington, Rick, author
Stress, health and well-being: thriving in the 21st century
Wadsworth and Cengage Learning, 2013
 Buku Teks
2020 vision health in the 21st century
National Academy Press, 1996
 Buku Teks
Friis, Robert H., author
Occupational health and safety for the 21st century
Jones &​ Bartlett Learning, 2016
 Buku Teks
Health care ethics: critical issues for the 21st century
edited by Eileen E. Morrison, Beth Furlong
Jones & Bartlett Learning, 2014
 Buku Teks
Ward, Ralph D.
21st century corporate board
John Wiley & Sons, 1997
 Buku Teks
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