(1999). Philippine Ports Authority 25th anniversary. Manila Bulletin.
Dyfyniad Arddull Chicago"Philippine Ports Authority 25th Anniversary." Manila Bulletin 1999.
Dyfyniad MLA"Philippine Ports Authority 25th Anniversary." Manila Bulletin, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.