Lua APA (7ú heag.)

Heide, L. (2009). Punched-Card Systems and the Early Information Explosion, 1880–1945. Johns Hopkins University Press.

Lua i Stíl Chicago (17ú heag.)

Heide, Lars. Punched-Card Systems and the Early Information Explosion, 1880–1945. Baltimore: Johns Hopkins University Press, 2009.

Lua MLA (9ú heag.)

Heide, Lars. Punched-Card Systems and the Early Information Explosion, 1880–1945. Johns Hopkins University Press, 2009.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.