Question: "Clifford's Really Big Movie" is based of a book series published by what publishing company?
Sentence (from "Clifford's Really Big Movie"): Clifford's Really Big Movie is an American animated musical epic adventure comedy-drama family film, loosely based on the book series "Clifford the Big Red Dog" by Norman Bridwell, and more closely based on the classic PBS Kids TV series adapted from it.
Relevant evidence: Yes