https://slideplayer.com/slide/13684996/
https://www.cdc.gov/nchs/fastats/homicide.htm
https://web.archive.org/web/20090212153622/http://www.taipeitimes.com/News/world/archives/2003/11/17/2003076195
https://en.wikipedia.org/wiki/Category:Chinese_people_convicted_of_murder
https://www.aljazeera.com/news/2003/11/14/chinese-serial-killer-suspect-arrested
https://vocal.media/criminal/serial-killer-yang-xinhai-the-deadly-consequences-of-keeping-the-public-in-the-dark
https://murderpedia.org/male.X/x/xinhai-yang.htm
http://www.absolutecrime.com/yang-xinhai.html
https://web.archive.org/web/20090212005616/http://www.taipeitimes.com/News/world/archives/2003/11/22/2003076826/print
https://www.chinafile.com/library/books/Tombstone
https://factsanddetails.com/china/cat2/sub6/entry-7457.html
https://www.theguardian.com/world/2013/jan/01/china-great-famine-book-tombstone
https://www.bbc.com/news/world-us-canada-45324622
https://www.dailymail.co.uk/news/article-6092553/Author-forecasts-wave-serial-killers-2035-thanks-war-economic-crisis-2008.html
https://www.fbi.gov/stats-services/publications/serial-murder
https://www.psychologytoday.com/intl/blog/unique-everybody-else/201812/are-murderers-unfairly-labeled-psychopaths
https://www.quora.com/Are-all-serial-killers-psychopaths
https://www.dailystar.co.uk/news/world-news/chinas-most-prolific-serial-killer-27546259
https://china-underground.com/2021/02/16/yang-xinhai/
https://en.wikipedia.org/wiki/Great_Leap_Forward#:~:text=The%20Great%20Leap%20Forward%20of,CCP)%20from%201958%20to%201962.
https://en.wikipedia.org/wiki/Yang_Xinhai
https://edubirdie.com/examples/serial-killers-types-factors-and-disorders/#:~:text=Based%20on%20a%20study%20carried,to%20be%20classified%20as%20psychopaths).
https://wickedness.net/serial-killer-articles/are-serial-killers-psychopaths/
https://en.wikipedia.org/wiki/Macdonald_triad