توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Headland, T. N. (1986). Why foragers do not become farmers: A historical study of a changing ecosystem and its effect on a Negrito hunter-gathered group in the Philippines. University of Hawaii.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Headland, Thomas Neil. Why Foragers Do Not Become Farmers: A Historical Study of a Changing Ecosystem and Its Effect on a Negrito Hunter-gathered Group in the Philippines. Honolulu, Hawaii: University of Hawaii, 1986.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Headland, Thomas Neil. Why Foragers Do Not Become Farmers: A Historical Study of a Changing Ecosystem and Its Effect on a Negrito Hunter-gathered Group in the Philippines. University of Hawaii, 1986.