edited by Rodolfo C. Severino and Lorraine Carlos Salazar
ISEAS, 2007
Buku Teks
Agoncillo, Teodora A.
A Mentor Book, 1969
Buku Teks
Costa, H. de la
Solidaridad Publishing House, 1967
Buku Teks
Costa, H. de la
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Buku Teks
Forbes, Cameron W.
Houghton Miffiln, 1928
Buku Klasik