In alphabetical order, the name of the author of the novel that the film Nuit de Chien was based on comes before Richard Llewellyn's.
Juan Carlos Onetti Borges (July 1, 1909, Montevideo  May 30, 1994, Madrid) was an Uruguayan novelist and author of short stories. 
Richard Dafydd Vivian Llewellyn Lloyd (8 December 1906  30 November 1983), known by his pen name Richard Llewellyn, was a British novelist. 
 It is based on the novel "Para esta noche" by Juan Carlos Onetti. 
