Hiromitsu Umehara. Koronadal Valley: Half a century after land settlement in South Cotabato, Mindanao. Philippine studies..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHiromitsu Umehara. "Koronadal Valley: Half a Century After Land Settlement in South Cotabato, Mindanao." Philippine Studies. .
एमएलए (9वां संस्करण) प्रशस्ति पत्रHiromitsu Umehara. "Koronadal Valley: Half a Century After Land Settlement in South Cotabato, Mindanao." Philippine Studies., .
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