Cita APA (7th ed.)

Borlagdan, P. (1995). Design and development of a two post rotary-percussion drilling rig. Philippine Engineering Journal.

Cita Chicago (17th ed.)

Borlagdan, Paterno. "Design and Development of a Two Post Rotary-percussion Drilling Rig." Philippine Engineering Journal 1995.

Cita MLA (9th ed.)

Borlagdan, Paterno. "Design and Development of a Two Post Rotary-percussion Drilling Rig." Philippine Engineering Journal, 1995.