(1998). Foreign trade of the Philippines: First semester 1997. NSO Monthly Bulletin Statistics.
Chicago (17e ed.) Bronvermelding"Foreign Trade of the Philippines: First Semester 1997." NSO Monthly Bulletin Statistics 1998.
MLA (9e ed.) Bronvermelding"Foreign Trade of the Philippines: First Semester 1997." NSO Monthly Bulletin Statistics, 1998.
Let op: Deze citaties zijn niet altijd 100% accuraat.