The information here is taken from the UN’s website, and from the book Human rights; questions and answers by Leah Levin. (You can download the book from UNESCO’s website here.)
Also, the information on the basic principles of human rights (sections 2 and 4 here) is often summarized in UN publications meant for the general public, such as this one (see pg. 9-16).
The menu on the right will take you to each of the pages, and the full table of contents is below.
Table of Contents