Ledesma, R. P. (2018). An outline of Philippine immigration and citizenship laws (2018 Edition.). Rex Book Store.
Chicago-referens (17:e uppl.)Ledesma, Ronaldo P. An Outline of Philippine Immigration and Citizenship Laws. 2018 Edition. Manila: Rex Book Store, 2018.
MLA-referens (9:e uppl.)Ledesma, Ronaldo P. An Outline of Philippine Immigration and Citizenship Laws. 2018 Edition. Rex Book Store, 2018.
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