Ritchie, W. (1940). John Gutenberg, 1440-1940: A fanciful story of the 15th Century. Ward Ritchie.
Cita Chicago Style (17a ed.)Ritchie, Ward. John Gutenberg, 1440-1940: A Fanciful Story of the 15th Century. Los Angeles: Ward Ritchie, 1940.
Cita MLA (9a ed.)Ritchie, Ward. John Gutenberg, 1440-1940: A Fanciful Story of the 15th Century. Ward Ritchie, 1940.
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