Penney, D. (2022). Morton's patent watches: Morton's patent, Morton's patent improved, patent chronometer, London patent chronometer, patent union chronometer (Revised and corrected edition.). David Penney.
Chicago-Zitierstil (17. Ausg.)Penney, David. Morton's Patent Watches: Morton's Patent, Morton's Patent Improved, Patent Chronometer, London Patent Chronometer, Patent Union Chronometer. Revised and corrected edition. Bishops Stortford: David Penney, 2022.
MLA-Zitierstil (9. Ausg.)Penney, David. Morton's Patent Watches: Morton's Patent, Morton's Patent Improved, Patent Chronometer, London Patent Chronometer, Patent Union Chronometer. Revised and corrected edition. David Penney, 2022.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.