Engler, Richard E., author
The challenge of diversity
Harper & Row, 1964
 Buku Teks
The challenge of management
edited by Alan M. Glassman
A Wiley/Hamilton Publication, 1978
 Buku Teks
Miner, John B., author
The challenge of managing
W.B. Saunders, 1975
 Buku Teks
Robit Nurul Jamil, author
Psychohistory gayatri rajapatni sebagai roh pancasilais
Yayasan Jurnal Perempuan, 2018
 Artikel Jurnal
Inter-Korean relations under roh moo-hyun
 Artikel Jurnal
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