Cita APA (7a ed.)

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.