Pierce, A. B. (1903). Classification and properties of dual conical congruences. Druck von Meyer & Hendess.
Lua i Stíl Chicago (17ú heag.)Pierce, Archie Burton. Classification and Properties of Dual Conical Congruences. Zürich: Druck von Meyer & Hendess, 1903.
Lua MLA (8ú heag.)Pierce, Archie Burton. Classification and Properties of Dual Conical Congruences. Druck von Meyer & Hendess, 1903.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.