Tupikova, I., & Soffel, M. Modelling ancient sundials: Ancient and modern errors / Irina Tupikova. Michael Soffel. Productive errors : scientific concepts in Antiquity.(2012).
Lua i Stíl Chicago (17ú heag.)Tupikova, Irina, agus Michael Soffel. "Modelling Ancient Sundials: Ancient and Modern Errors / Irina Tupikova. Michael Soffel." Productive Errors : Scientific Concepts in Antiquity.(2012) .
Lua MLA (8ú heag.)Tupikova, Irina, agus Michael Soffel. "Modelling Ancient Sundials: Ancient and Modern Errors / Irina Tupikova. Michael Soffel." Productive Errors : Scientific Concepts in Antiquity.(2012), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.