"Becoming a Great School: Harnessing the Powers of Quality Management and Collaborative Leadership". Book by Dr. Kenneth B. Cooper, Nels Gustafson and Joseph G. Salah (p. 9), December 24, 2013.
"Servant of Peace : A Selection of the Speeches and Statements of Dag Hammarskjöld, Secretary General of the United Nations". Book by Dag Hammarskjold, 1962.