For legal research:
http://attylaserna.blogspot.com/2016/01/divorce-abroad-between-filipino.html?m=1
Republic v. Manalo (2018).
https://www.lawphil.net/judjuris/juri2018/apr2018/gr_221029_2018.html
Republic v. Orbecido (2005).
https://lawphil.net/judjuris/juri2005/oct2005/gr_154380_2005.html.
http://hyperjetsetter.blogspot.com/2011/04/republic-vs-orbecido.html?m=1
Foreign divorce.
https://batasnatin.com/law-library/civil-law/persons-and-family/122-foreign-divorce.html
San Luis v. San Luis (2007).
https://lawphil.net/judjuris/juri2007/feb2007/gr_133743_2007.html
Amor-Catalan v. CA (2007).
https://lawphil.net/judjuris/juri2007/feb2007/gr_167109_2007.html
Corpuz v. Sto. Tomas (2010).
https://www.lawphil.net/judjuris/juri2010/aug2010/gr_186571_2010.html
Dacasin v. Dacasin (2010)
https://www.lawphil.net/judjuris/juri2010/feb2010/gr_168785_2010.html