APAOrganisation for Economic Co-operation and Development Staff. (2011). OECD Factbook 2011-2012: Economic, Environmental and Social Statistics. OECD.   https://doi.org/10.1787/factbook-2011-en   사이트   https://www.oecd-ilibrary.org/economics/oecd-factbook-2011-2012_factbook-2011-en   다운로드   https://www.oecd-ilibrary.org/oecd-factbook-2011-2012_5kg6qv3bqw7j.pdf?itemId=%2Fcontent%2Fpublication%2Ffactbook-2011-en&mimeType=pdf 

APAOrganisation for Economic Co-operation and Development Staff. (2010). OECD Factbook 2010: Economic, Environmental and Social Statistics. OECD. https://doi.org/10.1787/factbook-2010-en   사이트   https://www.oecd-ilibrary.org/economics/oecd-factbook-2010_factbook-2010-en   다운로드   https://www.oecd-ilibrary.org/oecd-factbook-2010_5kmlhlh7mknt.pdf?itemId=%2Fcontent%2Fpublication%2Ffactbook-2010-en&mimeType=pdf 

APAOrganisation for Economic Co-operation and Development Staff. (2009). OECD Factbook 2009: Economic, Environmental and Social Statistics. OECD.   https://doi.org/10.1787/factbook-2009-en   사이트  https://www.oecd-ilibrary.org/economics/oecd-factbook-2009_factbook-2009-en    다운로드  https://www.oecd-ilibrary.org/oecd-factbook-2009_5kskplxqkj9n.pdf?itemId=%2Fcontent%2Fpublication%2Ffactbook-2009-en&mimeType=pdf  

APAOrganisation for Economic Co-operation and Development Staff. (2008). OECD Factbook 2008: Economic, Environmental and Social Statistics. OECD.   https://doi.org/10.1787/factbook-2008-en   사이트   https://www.oecd-ilibrary.org/economics/oecd-factbook-2008_factbook-2008-en   다운로드   https://www.oecd-ilibrary.org/oecd-factbook-2008_5ksq4nxwmmf5.pdf?itemId=%2Fcontent%2Fpublication%2Ffactbook-2008-en&mimeType=pdf 

APAOrganisation for Economic Co-operation and Development Staff. (2007). OECD Factbook 2007: Economic, Environmental and Social Statistics. OECD.   https://doi.org/10.1787/factbook-2007-en   사이트   https://www.oecd-ilibrary.org/economics/oecd-factbook-2007_factbook-2007-en   다운로드   https://www.oecd-ilibrary.org/oecd-factbook-2007_5kmjrgqkfxs8.pdf?itemId=%2Fcontent%2Fpublication%2Ffactbook-2007-en&mimeType=pdf 

APAOrganisation for Economic Co-operation and Development Staff. (2006). OECD Factbook 2006: Economic, Environmental and Social Statistics. OECD. https://doi.org/10.1787/factbook-2006-en  사이트 https://www.oecd-ilibrary.org/economics/oecd-factbook-2006_factbook-2006-en 다운로드 https://www.oecd-ilibrary.org/oecd-factbook-2006_5kmjrgqmpl5g.pdf?itemId=%2Fcontent%2Fpublication%2Ffactbook-2006-en&mimeType=pdf 

APAOrganisation for Economic Co-operation and Development Staff. (2005). OECD Factbook 2005: Economic, Environmental and Social Statistics. OECD. https://doi.org/10.1787/factbook-2005-en  사이트 https://www.oecd-ilibrary.org/economics/oecd-factbook-2005_factbook-2005-en 다운로드 https://www.oecd-ilibrary.org/oecd-factbook-2005_5kmjrgqsld0r.pdf?itemId=%2Fcontent%2Fpublication%2Ffactbook-2005-en&mimeType=pdf 

사이트 http://hdr.undp.org/enhttp://hdr.undp.org/en/reports/national 

APA (연도 확실하지 않음) Gallup. (2017). What Happiness Today Tells Us About The World Tomorrow Report 다운로드 https://news.gallup.com/reports/220601/what-happiness-today-tells-us-about-the-world-tomorrow.aspx 

APA Helliwell, J. F., Layard, R., & Sachs, J. (2019). World happiness report 2019. New York: Sustainable Development Solutions Network. 다운로드     https://worldhappiness.report/ed/2019/