edited by Paul M. Wortman
Sage, 1981
Buku Teks
edited by Conrad Seipp. With a pref. by Cecil G. Sheps
The John Hopkins University Press , 1981
Buku Teks
Waltz, Carolyn Feher
Springer, 2017
Buku Teks
Bowling, Ann
Open University Press, 2006
Buku Teks
World Health Organization
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Buku Teks