Apollo Movie Guide: Nikki, Wild Dog of the North Review, links, and cast information. http://apolloguide.com/mov_revtemp.asp?CId=2214

IMDb: Nikki, Wild Dog of the North (1961) Cast/credits plus additional information about the film http://us.imdb.com/title/tt0055232/

IMDb: The Night Visitor (1970) Cast/credits plus additional information about the film http://us.imdb.com/title/tt0066141/