Leiyu Shi, James A. Johnson, editors
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Buku Teks
Garcia, Carolyn M
Indiana Sigma Theta Tau International, 2014
Buku Teks
Sax, Sidney
Allen & Unwin , 1990
Buku Teks
edited by J. Lloyd Michener, Denise Koo, Brian C. Castrucci, James B. Sprague
Oxford University Press, 2016
Buku Teks
Departemen Kesehatan, 1964
Buku Teks SO