Spring, M., Aderkas, N. v., Rukavina, F., & Peggie, D. (2017). An stronomer by Ferdinand Bol: Materials, Colour Change and Conservation. National Gallery Technical Bulletin : Volume 38.
Lua i Stíl Chicago (17ú heag.)Spring, Marika, Nelly von Aderkas, Flaminia Rukavina, agus David Peggie. "An Stronomer by Ferdinand Bol: Materials, Colour Change and Conservation." National Gallery Technical Bulletin : Volume 38 2017.
Lua MLA (8ú heag.)Spring, Marika, et al. "An Stronomer by Ferdinand Bol: Materials, Colour Change and Conservation." National Gallery Technical Bulletin : Volume 38, 2017.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.