Lua APA (7ú heag.)

Petroleum Institute of the Philippines, Inc. (1971). Topics on the oil industry. s.n.

Lua i Stíl Chicago (17ú heag.)

Petroleum Institute of the Philippines, Inc. Topics on the Oil Industry. [Manila: s.n, 1971.

Lua MLA (9ú heag.)

Petroleum Institute of the Philippines, Inc. Topics on the Oil Industry. s.n, 1971.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.