Philippines. Bureau of Agricultural Statistics. (2010). Producer price index for agriculture 2007-2009. Bureau of Agricultural Statistics.
Chicago-viite (17. p.)Philippines. Bureau of Agricultural Statistics. Producer Price Index for Agriculture 2007-2009. Quezon City: Bureau of Agricultural Statistics, 2010.
MLA-viite (9. p.)Philippines. Bureau of Agricultural Statistics. Producer Price Index for Agriculture 2007-2009. Bureau of Agricultural Statistics, 2010.
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