Citazione Stile APA (7a Edizione)

Philippines (Republic). Office of the President. Presidential Economic Staff. (1969). Provincial profile of Ilocos Sur. The PES.

Citazione stile Chigago Style (17a edizione)

Philippines (Republic). Office of the President. Presidential Economic Staff. Provincial Profile of Ilocos Sur. Manila: The PES, 1969.

Citatione MLA (9a ed.)

Philippines (Republic). Office of the President. Presidential Economic Staff. Provincial Profile of Ilocos Sur. The PES, 1969.