Koberer, Wolfgang (May 2016). "Notes: On the First Use of the Term "Chronometer"=". The Mariner's Mirror. 102 (2). United Kingdom: Society for Nautical Research: 203–205. doi:10.1080/00253359.2016.1167400. S2CID164165009.
Koberer, Wolfgang (May 2016). "Notes: On the First Use of the Term "Chronometer"=". The Mariner's Mirror. 102 (2). United Kingdom: Society for Nautical Research: 203–205. doi:10.1080/00253359.2016.1167400. S2CID164165009.