The basic format for citing a book chapter in MLA format is:
Author(s) of Chapter. "Title of Chapter: Subtitle of Chapter." Title of Book, edited by Editor of Book, Publisher, Publication Date, page numbers.
Kang-Brown, Jason, et al. "Zero-Tolerance Policies Do Not Make Schools Safer." School Safety, edited by Noah Berlatsky, Greenhaven Press, 2016, pp. 50-52.