Owen, N. G. (1974). The principalia in Philippine history Kabikolan, 1790-1898. Philippine Studies.
Lua i Stíl Chicago (17ú heag.)Owen, Norman G. "The Principalia in Philippine History Kabikolan, 1790-1898." Philippine Studies 1974.
Lua MLA (9ú heag.)Owen, Norman G. "The Principalia in Philippine History Kabikolan, 1790-1898." Philippine Studies, 1974.
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