APA aipamena

Simkins, P. D. (1990). Philippine migration: The settlement of Digos Padada Valley, Davao province. s. n.

Chicago Style aipamena

Simkins, Paul D. Philippine Migration: The Settlement of Digos Padada Valley, Davao Province. [s. l: s. n, 1990.

MLA aipamena

Simkins, Paul D. Philippine Migration: The Settlement of Digos Padada Valley, Davao Province. s. n, 1990.