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Artikel Jurnal
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Persatuan Pustakawan Malaysia, 2011
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Awwal, A.M.M. Anisul, author
Ministry of Health and Family Welfare, 2004
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Campbell-Johnson, Alan, author
E.P. Dutton, 1953
Buku Teks
Gasset, Jose Ortega Y., author
Routledge & Kegan Paul, 1952
Buku Teks