Hessels, J. H. (1882). Gutenberg: was he the inventor of printing?: An historical investigation embodying a criticism of Dr. van der Linde's "Gutenberg.". B. Quaritch.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHessels, Jan Hendrik. Gutenberg: Was He the Inventor of Printing?: An Historical Investigation Embodying a Criticism of Dr. Van Der Linde's "Gutenberg.". London: B. Quaritch, 1882.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHessels, Jan Hendrik. Gutenberg: Was He the Inventor of Printing?: An Historical Investigation Embodying a Criticism of Dr. Van Der Linde's "Gutenberg.". B. Quaritch, 1882.
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