APA Style

Opitz, M, F. (1998). Flexible Grouping in Reading: Practical Ways to Help all Students Become Better Readers Grades 2-5 . : Scholastic Professional Books.

MLA Style

Opitz, Michael, F.. "Flexible Grouping in Reading: Practical Ways to Help all Students Become Better Readers Grades 2-5". : Scholastic Professional Books, 1998. BOOK.