Eckhardt, G. H. (1955). Pennsylvania clocks and clockmakers: An epic of early American science, industry, and craftsmanship ; illustrated (3. print.). Bonzana Books.
Chicago-Zitierstil (17. Ausg.)Eckhardt, George H. Pennsylvania Clocks and Clockmakers: An Epic of Early American Science, Industry, and Craftsmanship ; Illustrated. 3. print. New York: Bonzana Books, 1955.
MLA-Zitierstil (9. Ausg.)Eckhardt, George H. Pennsylvania Clocks and Clockmakers: An Epic of Early American Science, Industry, and Craftsmanship ; Illustrated. 3. print. Bonzana Books, 1955.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.