Originally published in this form (B66-19264), London: Thames & Hudson, 1966. The third of three extracts from 'The century of the detective'. New York: Harcourt, Brace & World, 1965. Originally published as 'Das Jahrhundert der Detektive'. Zurich: Droemer, 1964.
Proof of poison by Jürgen Thorwald. ISBN 0330022768. Published by Pan Books in 1969. Publication and catalogue information, links to buy online and reader comments.