- Galileo, the Medici and the Age of Astronomy (fi.edu)
- Exhibition Review -’Galileo, the Medici and the Age of Astronomy’- The Cosmos, Surveyed (nytimes.com)
- Radisson Plaza-Warwick Hotel Philadelphia (radisson.com)
- Istituto e Museo di Storia della Scienza (fi.it)
- Galileo’s Battle for the Heavens (pbs.org)
- 400 Hundred Years of the Telescope (400years.org)

- Archimedes (wikipedia.com)
- Euclid (wikipedia.com)
- Renaissance Astronomy (byu.edu)

- The Nautical Almanac (navy.mil)
- Her Majesty Nautical Almanac Office (hmnao.com)

Scientific Instruments:
- Celestaire Inc.
- Astrolab
- Sextant
- Davis Quadrant
- Compass
- Sundial
- Theodolite

- For Hispanic Firefighter in Bias Suit, Awkward Position but Firm Resolve (nytimes.com)
- Mural Arts Program: Philadelphia (muralarts.org)