Tomiyama
Institute of Social Science, University of Tokyo, 1998
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Lindeman, Carol A.
W.B. Saunders, 1999
Buku Teks
Green, Marilyn L.
John Wiley & Sons, 1981
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Wolters Kluwer Health/Lippincott Williams & Wilkins, 2012
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Boyd, Mary Ann
Wolters Kluwer, 2018
Buku Teks SO