Cita APA (7th ed.)

Philippines. Department of Trade & Research and Information Division. The Philippines' twenty leading imports, 1968-1972-. [s.n.

Cita Chicago (17th ed.)

Philippines. Department of Trade i Research and Information Division. The Philippines' Twenty Leading Imports, 1968-1972-. Quezon City: [s.n.

Cita MLA (9th ed.)

Philippines. Department of Trade i Research and Information Division. The Philippines' Twenty Leading Imports, 1968-1972-. [s.n.