Solving simple substitution ciphers.
APA Citation
Harris, F. A., American Cryptogram Association. (1943). Solving simple substitution ciphers. [Rochester, N.Y.]: The American cryptogram association.
MLA Citation
Harris, Frances A, and American Cryptogram Association. Solving Simple Substitution Ciphers. [Rochester, N.Y.]: The American cryptogram association, 1943.
Warning: These citations may not always be complete (especially for serials).