Cita APA (7th ed.)

Private Development Corporation of the Philippines. (1973). The portland cement industry. s.n.].

Cita Chicago (17th ed.)

Private Development Corporation of the Philippines. The Portland Cement Industry. [Makati, Rizal: s.n.], 1973.

Cita MLA (9th ed.)

Private Development Corporation of the Philippines. The Portland Cement Industry. s.n.], 1973.