International Civil Aviation Organization. Digest of statistics. Series OFOD, On-flight origin and destination. International Civil Aviation Organization.
Chicago Style (17th ed.) CitationInternational Civil Aviation Organization. Digest of Statistics. Series OFOD, On-flight Origin and Destination. Montreal: International Civil Aviation Organization.
MLA (9th ed.) CitationInternational Civil Aviation Organization. Digest of Statistics. Series OFOD, On-flight Origin and Destination. International Civil Aviation Organization.
Warning: These citations may not always be 100% accurate.