APA
Van de Walle J. A., . (2001). Elementary and middle school mathematics. New York: Longman Pub Group.
Chicago
Van de Walle John A, . 2001. Elementary and middle school mathematics. New York: Longman Pub Group.
Harvard
Van de Walle J. A., . (2001). Elementary and middle school mathematics. New York: Longman Pub Group.
MLA
Van de Walle John A, . Elementary and middle school mathematics. New York: Longman Pub Group. 2001.