APA Style

Checkley, K. (2006). The Essentials of Mathematics K-6: Effective Curriculum, Instruction, and Assessment . : Association for Supervision and Curriculum Development (ASCD).

MLA Style

Checkley, Kathy. "The Essentials of Mathematics K-6: Effective Curriculum, Instruction, and Assessment". : Association for Supervision and Curriculum Development (ASCD), 2006. BOOK.