Cita APA (7th ed.)

Philippines. The National Library & Bibliographic Services Division. (1989). Directory of printers and publishers. Bibliographic Services Division, The National Library of the Philippines.

Cita Chicago (17th ed.)

Philippines. The National Library i Bibliographic Services Division. Directory of Printers and Publishers. Manila: Bibliographic Services Division, The National Library of the Philippines, 1989.

Cita MLA (9th ed.)

Philippines. The National Library i Bibliographic Services Division. Directory of Printers and Publishers. Bibliographic Services Division, The National Library of the Philippines, 1989.