http://www.prisonstudies.org/highest-to-lowest/occupancy-level?field_region_taxonomy_tid=All
https://www.nytimes.com/2019/01/07/world/asia/philippines-manila-jail-overcrowding.html
https://www.chiangmaicitylife.com/news-archive/glad-to-be-back-not-a-tale-of-two-prisons/
https://work.chron.com/many-correctional-officers-staff-jails-30263.html
https://www.quora.com/Whats-the-guard-to-inmate-ratio-in-US-penitentiaries
https://www.philstar.com/nation/2018/06/28/1828475/55-detainees-have-died-overcrowded-mpd-jails-july-2016
https://www.philstar.com/nation/2018/06/28/1828475/55-detainees-have-died-overcrowded-mpd-jails-july-2016
https://www.preda.org/2009/08/the-condition-of-philippine-prisons-and-jails/