Burns, G. J., "The total amount of starlight and the brightness of the sky," The Observatory, Vol. 33, p. 123-129, March 1910; available at SAO/NASA Astrophysics Data System 3 Kasım 2019 tarihinde Wayback Machine sitesinde arşivlendi. (retrieved 27 Nov. 2015)
Yntema, L., "On the Brightness of the Sky and Total Amount of Starlight," Publications of the Kapteyn Astronomical Laboratory Groningen, vol. 22, pp.1-55 (1909); available at SAO/NASA Astrophysics Data System 3 Kasım 2019 tarihinde Wayback Machine sitesinde arşivlendi. (retrieved 27 Nov. 2015)
Burns, G. J., "The total amount of starlight and the brightness of the sky," The Observatory, Vol. 33, p. 123-129, March 1910; available at SAO/NASA Astrophysics Data System 3 Kasım 2019 tarihinde Wayback Machine sitesinde arşivlendi. (retrieved 27 Nov. 2015)
Yntema, L., "On the Brightness of the Sky and Total Amount of Starlight," Publications of the Kapteyn Astronomical Laboratory Groningen, vol. 22, pp.1-55 (1909); available at SAO/NASA Astrophysics Data System 3 Kasım 2019 tarihinde Wayback Machine sitesinde arşivlendi. (retrieved 27 Nov. 2015)