http://iprea.org
Institute of Philippine Real Estate Appraisers (IPREA)

http://www.bir.gov.ph/zonalvalues/zonalvalues.htm
Bureau of Internal (BIR)

http://www.ivsc.org
International Valuation Standards Committee (IVSC) 

http://www.pse.com.ph
The Philippine Stock Exchange, Inc. (PSE)

http://www.metric-conversions.org
Metric Convertions