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It can be referenced a number of ways, "Star Wars", "A New Hope", "Episode IV" or "Star Wars Episode IV: A New Hope"
Star Wars Episode IV : A New Hope
Star Wars Episode IV: A New Hope debuted May 25, 1977 .
Yoda did not appear in the original Star Wars, A New Hope.
Star Wars Episode IV: A New Hope (a.k.a. the original released as just "Star Wars" in 1977).