Which book citations are formatted correctly? harwood, ronald. mandela, 1987. print. new york: new american library. brookes, edgar harry. apartheid. new york: barnes & noble, 1968. print. maltz, leora. nelson mandela. san diego: greenhaven, 2004. print. tree shaker: the story of nelson mandela. keller, bill. boston: kingfisher, 2008. print. evans, michael. south africa. new york: gloucester, 1988. print. smith, david james. new york: little, brown, 2010. young mandela. print.

Citing a book in print includes author's name(s), title of the book, and publication information. 

Its correct format is:

Last, First M. Book. City: Publisher, Year Published. Print.

So, among the choices:
Harwood, Ronald. Mandela, 1987. Print. New York: New American Library.

Brookes, Edgar Harry. Apartheid. New York: Barnes & Noble, 1968. Print.  - CORRECT

Maltz, Leora. Nelson Mandela. San Diego: Greenhaven, 2004. Print. - CORRECT

Tree Shaker: The Story of Nelson Mandela. Keller, Bill. Boston: Kingfisher, 2008. Print.

Evans, Michael. South Africa. New York: Gloucester, 1988. Print. - CORRECT

Smith, David James. New York: Little, Brown, 2010. Young Mandela. Print.