Royama, M., Friend, T., & Takeuchi, T. 1. (1967). The Philippine polity: A Japanese view. Yale University, Southeast Asia Studies.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRoyama, Masamichi, Theodore Friend, और Tatsuji 1904 Takeuchi. The Philippine Polity: A Japanese View. [New Haven]: Yale University, Southeast Asia Studies, 1967.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRoyama, Masamichi, et al. The Philippine Polity: A Japanese View. Yale University, Southeast Asia Studies, 1967.
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