Selected introductions to the theory and practice of international human rights protection are:
The secondary literature, both books and journals, on the international protection of human rights is massive. An efficient solution in libraries is to use the Library of Congress subject heading "Human rights". This heading can be subdivided by country, e.g., "Human rights -- Colombia".
Thematic searching is also possible using Library of Congress subject headings or keyword searches, e.g., "Children's rights", "Detention of persons", "Disappeared persons", "Fair trial", "Freedom of expression", "Freedom of religion", "Political prisoners", "Torture", and so on.