Worcester, D. C. (1913). Slavery and Peonage in the Philippine Islands. Manila.
Lua i Stíl Chicago (17ú heag.)Worcester, Dean C. Slavery and Peonage in the Philippine Islands. Manila, 1913.
Lua MLA (8ú heag.)Worcester, Dean C. Slavery and Peonage in the Philippine Islands. Manila, 1913.
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