Peter Henlein (Simple English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Peter Henlein" in Simple English language version.

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about.com

"It's About (German) Time". About.com. Archived from the original on 2008-09-28. Retrieved 2008-12-12.

"Clock". The New Encyclopaedia Britannica. Vol. 4. Univ. of Chicago. 1974. p. 747. ISBN 0852292902.
Usher, Abbot Payson (1988). A History of Mechanical Inventions. Courier Dover. ISBN 048625593X., p.305
Dohrn-van Rossum, Gerhard (1997). History of the Hour: Clocks and Modern Temporal Orders. Univ. of Chicago Press. ISBN 0-226-15510-2., p.121

"It's About (German) Time". About.com. Archived from the original on 2008-09-28. Retrieved 2008-12-12.