Citazione Stile APA (7a Edizione)

(1962). Land classification: Province of Isabela ; sub-province of Bontoc and Ifugao. Bureau of Forestry.

Citazione stile Chigago Style (17a edizione)

Land Classification: Province of Isabela ; Sub-province of Bontoc and Ifugao. Manila: Bureau of Forestry, 1962.

Citatione MLA (9a ed.)

Land Classification: Province of Isabela ; Sub-province of Bontoc and Ifugao. Bureau of Forestry, 1962.