Philippines. Office of the President. Presidential Economic Staff. (1969). Provincial profile of Ilocos Norte. s.n.
Citace podle Chicago (17th ed.)Philippines. Office of the President. Presidential Economic Staff. Provincial Profile of Ilocos Norte. [Manila: s.n, 1969.
Citace podle MLA (9th ed.)Philippines. Office of the President. Presidential Economic Staff. Provincial Profile of Ilocos Norte. s.n, 1969.
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