APA (7th ed.) Citation

Engdahl, S. (1981). The doors of the universe. Athenuem.

Chicago Style (17th ed.) Citation

Engdahl, Sylvia. The Doors of the Universe. New York: Athenuem, 1981.

MLA (9th ed.) Citation

Engdahl, Sylvia. The Doors of the Universe. Athenuem, 1981.

Warning: These citations may not always be 100% accurate.