Ein Klopfen an der Tür

From Author Wars - https://authorwars.com/books/ein-klopfen-an-der-tur-1998754.html

Overview:

Title: Ein Klopfen an der Tür
Author: Fredric Brown
Year: 1981
Type: Short Fiction

Editions/Publications:

Unknown. Die besten SF-Stories von Fredric Brown (Unknown, Fredric Brown, Moewig, ISBN-10: 3811820168, DM 19.80, 333 pages, Hardcover, Collection)