Norton, A. M., & Norton, A. (1965). The X factor ([1st ed.].). Harcourt, Brace & World.
Chicago Style (17th ed.) CitationNorton, Alice Mary, and Andre Norton. The X Factor. [1st ed.]. New York: Harcourt, Brace & World, 1965.
MLA (9th ed.) CitationNorton, Alice Mary, and Andre Norton. The X Factor. [1st ed.]. Harcourt, Brace & World, 1965.
Warning: These citations may not always be 100% accurate.