Is there a website that will help find a book that you don't know the author and

[little big mama]

name of it? This is a old old si/fi book about a interstellar kidnapping of two young men and women who only have in common no friends or family.They were dumped on a Earth like planet unknowing that there was two more couples of humanoids from another planet nearby and a fight broke out when the humans killed the alien couples. I have ben hunting for a copy of this book for years.Any help appreciated.