If you aren't sure where to begin, consider using these resources to select books.
For instance, the Campaign for America's Libraries has produced a series of short videos of authors who have written books about the Latino experience: http://www.atyourlibrary.org/connectwithyourkids/reading-together/top-10-spanish-books-kids
Many publishers in the English-speaking world are beginning to recognize the interest their consumers have in learning some Mandarin, Cantonese or other related languages. There are a number of books in these languages. Some are English language titles that have been translated, while others are geared towards learning more about Chinese culture and traditions: http://www.chinesebookshop.com/english/chinese-english-books/mandarin-english.html
Share your experiences and ideas regarding Spanish and Chinese language titles on our TWIN Forum: http://www.twin-cs.org/forum.html#/20140224/expanding-our-libraries-adding-spanish-and-ma-2-3703315/
-Mary Bridget Burns