Lua APA (7ú heag.)

(1982). Karl Otto.

Lua i Stíl Chicago (17ú heag.)

Karl Otto. Karl-Marx-Stadt, 1982.

Lua MLA (8ú heag.)

Karl Otto. 1982.

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