Cita APA (7th ed.)

Selirio, . B. (1977). Ports and harbors in the philippines today. Department of Public Works, Transportation and Communications.

Cita Chicago (17th ed.)

Selirio, Benedicto. Ports and Harbors in the Philippines Today. [Manila]: Department of Public Works, Transportation and Communications, 1977.

Cita MLA (9th ed.)

Selirio, Benedicto. Ports and Harbors in the Philippines Today. Department of Public Works, Transportation and Communications, 1977.