Primo Levi

If Not Now, When? is a novel by the Italian author Primo Levi, first published in 1982 under the title Se non ora, quando?

The Sixth Day and Other Tales, written by Primo Levi, is a collection of short stories, originally published in Storie naturali and Vizio di forma. Unlike the author's earlier and better-known works, these stories may be considered science fiction.