Worcester, D. C. (1913). Slavery and Peonage in the Philippine Islands. Manila.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWorcester, Dean C. Slavery and Peonage in the Philippine Islands. Manila, 1913.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWorcester, Dean C. Slavery and Peonage in the Philippine Islands. Manila, 1913.
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