Petroleum Institute of the Philippines, I. (1966). The Refining and marketing of petroleum in the Philippines. [s.n.].
Citazione stile Chigago Style (17a edizione)Petroleum Institute of the Philippines, Inc. The Refining and Marketing of Petroleum in the Philippines. Manila: [s.n.], 1966.
Citatione MLA (9a ed.)Petroleum Institute of the Philippines, Inc. The Refining and Marketing of Petroleum in the Philippines. [s.n.], 1966.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.