- 1518 X 22 – to the Warmian Chapter
- 1524 II 29 – to Mauritius Ferber
- 1526 IV 19 – to Felix Reich
- 1531 VII 27 – to Mauritius Ferber
- 1533 IV 11 – to John Dantiscus
- 1536 VI 8 – to John Dantiscus
- 1537 VIII 9 – to John Dantiscus
- 1538 IV 25 – to John Dantiscus
- 1538 XII 2 – to John Dantiscus
- 1539 I 11 – to John Dantiscus
- 1539 III 11 – to John Dantiscus
- 1539 III 3 – to John Dantiscus
- 1541 IX 28 – to John Dantiscus
- 1541 VI 15 – to Duke Albrecht of Prussia
- 1541 VI 21 – to Duke Albrecht of Prussia
- 1541 VI 27 – to John Dantiscus
- About the Copernicus’ Letters
- Authentic writings of Copernicus
- Copernicus’ Letters
- Letter against Werner