(2000). All A.O. 121 and 135 operators. Philippine Star.
Chicago Style aipamena"All A.O. 121 and 135 Operators." Philippine Star 2000.
MLA aipamena"All A.O. 121 and 135 Operators." Philippine Star, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.