APA

Cryer D., Harms T. & Bourland B. (1988). Active learning for twos. Menlo Park, Calif: Addison-Wesley Pub. Co.

Chicago

Cryer Debby, Harms Thelma and Bourland Beth. 1988. Active learning for twos. Menlo Park, Calif: Addison-Wesley Pub. Co.

Harvard

Cryer D., Harms T. and Bourland B. (1988). Active learning for twos. Menlo Park, Calif: Addison-Wesley Pub. Co.

MLA

Cryer Debby, Harms Thelma and Bourland Beth. Active learning for twos. Menlo Park, Calif: Addison-Wesley Pub. Co. 1988.