Borlagdan, P. (1995). Design and development of a two post rotary-percussion drilling rig. Philippine Engineering Journal.
Citazione stile Chigago Style (17a edizione)Borlagdan, Paterno. "Design and Development of a Two Post Rotary-percussion Drilling Rig." Philippine Engineering Journal 1995.
Citatione MLA (9a ed.)Borlagdan, Paterno. "Design and Development of a Two Post Rotary-percussion Drilling Rig." Philippine Engineering Journal, 1995.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.