Hiromitsu Umehara. Koronadal Valley: Half a century after land settlement in South Cotabato, Mindanao. Philippine studies..
芝加哥风格引文Hiromitsu Umehara. "Koronadal Valley: Half a Century After Land Settlement in South Cotabato, Mindanao." Philippine Studies. .
MLA引文Hiromitsu Umehara. "Koronadal Valley: Half a Century After Land Settlement in South Cotabato, Mindanao." Philippine Studies., .
警告：这些引文格式不一定是100％准确.