Wade, Nicholas J.; Finger, Stanley. The eye as an optical instrument: from camera obscura to Helmholtz's perspective // Perception 30 (10). 2001. DOI:10.1068/p3210. с. 1157 – 77.
φάος, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
γραφή, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
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hrc.utexas.edu
The First Photograph – Heliography // Архивиран от оригинала на 2009-01-29. Посетен на 29 септември 2009. from Helmut Gernsheim's article, „The 150th Anniversary of Photography“, in History of Photography, Vol. I, No. 1, January 1977: ...In 1822, Niépce coated a glass plate... The sunlight passing through... This first permanent example... was destroyed... some years later.
web.archive.org
The First Photograph – Heliography // Архивиран от оригинала на 2009-01-29. Посетен на 29 септември 2009. from Helmut Gernsheim's article, „The 150th Anniversary of Photography“, in History of Photography, Vol. I, No. 1, January 1977: ...In 1822, Niépce coated a glass plate... The sunlight passing through... This first permanent example... was destroyed... some years later.
