Lua APA (7ú heag.)

Ritter, J. (1989). P - Q. Schwabe.

Lua i Stíl Chicago (17ú heag.)

Ritter, Joachim. P - Q. Basel: Schwabe, 1989.

Lua MLA (8ú heag.)

Ritter, Joachim. P - Q. Schwabe, 1989.

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