Tom Weaver, Science Fiction Confidential: Interviews with 23 Monster Stars and Filmmakers, McFarland & Company, 1º gennaio 2002, p. 21, ISBN 978-0-7864-1175-7.
«I was working on the script [for The Unearthly], delivering pages, and then I realized it would become a nightmare if I kept doing it that way. So I just didn't show up for ten days, and finished it. I delivered it to Mr. Petroff, who gave it to Jane, his wife, who typed it. I can't type. [...] And then it was time for the picture to be edited and for credits to be discussed, and it turns out that Jane Mann, who was the one who typed the script last, put her name on it. And Mr. Petroff was not gonna pay me.»
