Could not answer
Hakikat Kitabevi, 1993
 Buku Teks
Francisco, Juan R.
Philippine palaeography
Linguistic Society of The Philippines, 1973
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Schatten, Fritz
Communism in Africa
Frederick A. Praeger, 1966
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Forbes, W. Cameron
Philippine Islands
Houghton Mifflin, 1928
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Reyess, Elizabeth
Houses in the Philippine
Tuttle Publishing, 2012.
 Buku Teks