Cita APA (7th ed.)

(1973). Principal transportation systems in the Philippines. [s.n.].

Cita Chicago (17th ed.)

Principal Transportation Systems in the Philippines. [Manila]: [s.n.], 1973.

Cita MLA (9th ed.)

Principal Transportation Systems in the Philippines. [s.n.], 1973.

Atenció: Aquestes cites poden no estar 100% correctes.