The cat in the hat dictionary,
by the Cat himself and P. D. Eastman.
APA Citation
Seuss, D., Eastman, P. D. (Philip D.). (1964). The cat in the hat dictionary. [New York]: Beginner Books.
MLA Citation
Seuss, Dr, and P. D. (Philip D.) Eastman. The Cat In the Hat Dictionary. [New York]: Beginner Books, 1964.
Warning: These citations may not always be complete (especially for serials).