(2007). 2005 annual survey of Philippine business and industry: Transport, storage, and communications sector (preliminary results). NSO Monthly Bulletin Statistics.
Chicago-viite (17. p.)"2005 Annual Survey of Philippine Business and Industry: Transport, Storage, and Communications Sector (preliminary Results)." NSO Monthly Bulletin Statistics 2007.
MLA-viite (9. p.)"2005 Annual Survey of Philippine Business and Industry: Transport, Storage, and Communications Sector (preliminary Results)." NSO Monthly Bulletin Statistics, 2007.
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