LOWDEN, D. (1983). Briges The Spans Of North America David Plowden. W.W. Norton & Company.
Lua i Stíl Chicago (17ú heag.)LOWDEN, David. Briges The Spans Of North America David Plowden. W.W. Norton & Company, 1983.
Lua MLA (8ú heag.)LOWDEN, David. Briges The Spans Of North America David Plowden. W.W. Norton & Company, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.