1. http://www.skvscrapercenter.com/ (Accessed 31.10.2017)
2. http://psa.gov.ph/content/philippine-population-density-based-2015-census-population (Accessed 2.11.2017)
3. http://global.ctbuh.org/resources/papers/download/1269-building-cost-and-eco-cost-aspects-of-tall-buildings.pdf (Accessed 7.11.2017)
4. de Jong P., and Van Oss S.. Hight Rise Ability. In 14th Annual European Real Estate Society Conference. ERES: Conference. London, UK, (2007).
5. http://skyscraperpage.com/diagrams/?cityID=14 (Accessed 13.11.2017)