APA (7th ed.) Citation

COX, G., Default, C., & Hopkins, W. (1992). 50 activities for creativity and problem solving. Gower.

Chicago Style (17th ed.) Citation

COX, Geof, Chuck Default, and Walt Hopkins. 50 Activities for Creativity and Problem Solving. Amherst, MA: Gower, 1992.

MLA (8th ed.) Citation

COX, Geof, et al. 50 Activities for Creativity and Problem Solving. Gower, 1992.