APA

Whimbey A., Lochhead J., . (1981). Developing mathematical skills: computation, problem solving, and basics for algebra. New York: McGraw-Hill.

Chicago

Whimbey Arthur, Lochhead Jack, . 1981. Developing mathematical skills: computation, problem solving, and basics for algebra. New York: McGraw-Hill.

Harvard

Whimbey A., Lochhead J., . (1981). Developing mathematical skills: computation, problem solving, and basics for algebra. New York: McGraw-Hill.

MLA

Whimbey Arthur, Lochhead Jack, . Developing mathematical skills: computation, problem solving, and basics for algebra. New York: McGraw-Hill. 1981.