APA (7th ed.) Citation

Higgins, J., & Higgins, M. (1987). Double up: A text rebuilding game. Research Design Associates.

Chicago Style (17th ed.) Citation

Higgins, John, and Muriel Higgins. Double Up: A Text Rebuilding Game. Stony Brook, N.Y.: Research Design Associates, 1987.

MLA (9th ed.) Citation

Higgins, John, and Muriel Higgins. Double Up: A Text Rebuilding Game. Research Design Associates, 1987.