Cook, F. S., Morrison, P. C., Trytten, J. M., & Whale, L. J. (1959). Gregg Junior high typing. McGraw-Hill book Co. Inc..

Cook, Fred S., Phyllis C. Morrison, John M. Trytten, and Leslie J. Whale. Gregg Junior High Typing. London: McGraw-Hill book Co. Inc., 1959.

Cook, Fred S., et al. Gregg Junior High Typing. McGraw-Hill book Co. Inc., 1959.