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    Published 2017
    Book
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  8. 8
    by Singh, V.K
    Published 2013
    Book
  9. 9
    by Alcazaren, Paulo
    Published in Philippine Star (2010)
    Article
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  14. 14
    by Craul, Phillip J.
    Published 1992
    Book
  15. 15
    by Nadel, Ira Bruce
    Published 1977
    Book
  16. 16
    Published 1967
    Book