The Night the Monster Came by Mary Calhoun (Very good, 1982, HC, 62 pages, Weekly Reader Books)

Used in good condition. ISBN 0688011675

Of all the monsters on TV, Bigfoot frightens Andy most of all because he's supposedly been seen where Andy lives. Then comes the week when Andy is alone. First he hears strange noises. Then he sees huge footprints in the snow outside!