Hi Jim,..well, it seems that the Brad Steiger/Joan Whritenour book [Flying Saucers are Hostile. 1967] is not the origin of the quote after all!
Because though it does contain the quote that has been attributed to 'Wernher Von Braun', ...when I contacted Brad Steiger himself and asked about the the history of the quote, he sent me this reply...
"Hi, Alex, you are not pestering. I wish I could be of more help. I wrote that book with Joan 55 years ago. She did the research for the book, and she had several sources for the quote. It was in wide circulation at that time. I have moved five times since 1959. Each time, the files thin out and some must be left behind. Best of success in all of your research."
And from this 'short but clear' reply, I assume that either Joan has copied the quote from a different source, ie. the as-of-yet unknown 'west german newspaper' that Von Braun is alleged to have
" told West German newspapers that a 1958 malfunction of a US Juno II rocket had been "deflected" off-course by an unnamed and presumably extraterrestrial source."
...or maybe it was 'Joan' that has misquoted the article in the '1959 Neues Europa' that your friend found for you?..[by the way Jim, could you provide me with the link for that archived copy...just to tie up loose ends?]
I am not quite done with this thing though..[i'm still searching for the articles from the '1958 West German newspapers' to see if there could still be something to the story?]...but I will say that it is starting to look like Tim Good has reproduced the 'quote' from Brad and Joan's book (Flying Saucers Are Hostile), and then Clark C McClelland has then gone and pilfered the publicity-rights in a bid to boost his public stature!...But then..I could be totally wrong?