APA (7th ed.) Citation

Glut, D. F., & Lucas, G. (1980). The Empire strikes back: From the adventures of Luke Skywalker : a novel. Sphere.

Chicago Style (17th ed.) Citation

Glut, Donald F., and George Lucas. The Empire Strikes Back: From the Adventures of Luke Skywalker : A Novel. London: Sphere, 1980.

MLA (8th ed.) Citation

Glut, Donald F., and George Lucas. The Empire Strikes Back: From the Adventures of Luke Skywalker : A Novel. Sphere, 1980.