APA aipamena

Philippines. Office of the President. Presidential Economic Staff. (1969). Provincial profile of Isabela. s.n.

Chicago Style aipamena

Philippines. Office of the President. Presidential Economic Staff. Provincial Profile of Isabela. [Manila: s.n, 1969.

MLA aipamena

Philippines. Office of the President. Presidential Economic Staff. Provincial Profile of Isabela. s.n, 1969.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.