Matthews, J. Seven spots and a squiggle: The prehistory of pictures / John Matthews. Origins of pictures : anthropological discourses in image science.(2013).
Lua i Stíl Chicago (17ú heag.)Matthews, John. "Seven Spots and a Squiggle: The Prehistory of Pictures / John Matthews." Origins of Pictures : Anthropological Discourses in Image Science.(2013) .
Lua MLA (8ú heag.)Matthews, John. "Seven Spots and a Squiggle: The Prehistory of Pictures / John Matthews." Origins of Pictures : Anthropological Discourses in Image Science.(2013), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.