Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.