Thorwald, J., Winston, R., & Winston, C. (1969). Proof of poison: Jürgen Thorwald. [Transl. from the German by Richard and Clara Winston] (Unabridged.). Pan Books.
Lua i Stíl Chicago (17ú heag.)Thorwald, Jürgen, Richard Winston, agus Clara Winston. Proof of Poison: Jürgen Thorwald. [Transl. from the German by Richard and Clara Winston]. Unabridged. London: Pan Books, 1969.
Lua MLA (8ú heag.)Thorwald, Jürgen, et al. Proof of Poison: Jürgen Thorwald. [Transl. from the German by Richard and Clara Winston]. Unabridged. Pan Books, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.