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Buku Teks
Dewey, Melvil, author
OCLC Online Computer Library Center, Inc., 2011
Buku Referensi
Benson, Lyman, author
D.C. Heath , 1957
Buku Teks
World Health Organization, 1993
Buku Teks
editor, M. Goodfellow, A.G. O`Donnel
Academic Press, 1993
Buku Referensi