Astroláb z vraku Esmeraldy, D.L.Mearns et al., An Early Portuguese Mariner's Astrolabe from the Sodré Wreck-site, Al Hallaniyah, Oman, International Journal of Nautical Archaeology, CC BY 4.0, https://creativecommons.org/licenses/by/4.0/ .

Astroláb z vraku Esmeraldy, D.L.Mearns et al., An Early Portuguese Mariner's Astrolabe from the Sodré Wreck-site, Al Hallaniyah, Oman,  International Journal of Nautical Archaeology, CC BY 4.0, https://creativecommons.org/licenses/by/4.0/ .