Thorwald, J., Winston, R., & Winston, C. (1969). Proof of poison: Jürgen Thorwald. [Transl. from the German by Richard and Clara Winston] (Unabridged.). Pan Books.

Thorwald, Jürgen, Richard Winston, and Clara Winston. Proof of Poison: Jürgen Thorwald. [Transl. from the German by Richard and Clara Winston]. Unabridged. London: Pan Books, 1969.

Thorwald, Jürgen, et al. Proof of Poison: Jürgen Thorwald. [Transl. from the German by Richard and Clara Winston]. Unabridged. Pan Books, 1969.