Dyfyniad APA

Epstein, S., & Epstein, B. W. (1956). The first book of codes and ciphers. New York: Franklin Watts.

Dyfyniad Arddull Chicago

Epstein, Sam., và Beryl Williams Epstein. The First Book of Codes and Ciphers. New York: Franklin Watts, 1956.

Dyfyniad MLA

Epstein, Sam., và Beryl Williams Epstein. The First Book of Codes and Ciphers. New York: Franklin Watts, 1956.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.