APA

Holt M., Dienes Z. P., . (1973). Let's play math. New York: Walker.

Chicago

Holt Michael, Dienes Zoltan P, . 1973. Let's play math. New York: Walker.

Harvard

Holt M., Dienes Z. P., . (1973). Let's play math. New York: Walker.

MLA

Holt Michael, Dienes Zoltan P, . Let's play math. New York: Walker. 1973.