1. Akita T, Pagulayan M (2013) Structural changes and interregional income inequality in the Philippines, 1975–2009. Niigata, International University of Japan, IUJ Research Institute, p 28
2. Alcazaren P (2011) Lungsod iskwater: the evolution of informality as a dominant pattern in Philippine cities. Anvil Publishing, Mandaluyong, p 252
3. Aldaba F et al (2009) Poverty in the Philippines. Causes, constraints and opportunities. Asian Development Bank, Mandaluyong, 124
4. Alip E (1975) The barangay through the ages: a study of the oldest Philippine political institution. Alip and Sons, Manila, 155 p
5. Ambanta J (2014) Slum dwellers seen ballooning to 12m, Manila Standard, 14 May 2014