Lua APA (7ú heag.)
Stewart, J. (2008). Heiberg's Contingency regarded from the point of view of logic and other texts. Museum Tusculanum Press.
Lua i Stíl Chicago (17ú heag.)
Stewart, Jon. Heiberg's Contingency Regarded from the Point of View of Logic and Other Texts. Copenhagen, Denmark: Museum Tusculanum Press, 2008.
Lua MLA (9ú heag.)
Stewart, Jon. Heiberg's Contingency Regarded from the Point of View of Logic and Other Texts. Museum Tusculanum Press, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.