Hiromitsu Umehara. Koronadal Valley: Half a century after land settlement in South Cotabato, Mindanao. Philippine studies..
Citazione stile Chigago Style (17a edizione)Hiromitsu Umehara. "Koronadal Valley: Half a Century After Land Settlement in South Cotabato, Mindanao." Philippine Studies. .
Citatione MLA (9a ed.)Hiromitsu Umehara. "Koronadal Valley: Half a Century After Land Settlement in South Cotabato, Mindanao." Philippine Studies., .
Attenzione: Queste citazioni potrebbero non essere precise al 100%.