APA
T. Stephen, . (1980). Tetrahedon Letters. New York: Pergamon Press.
Chicago
T. Stephen, . 1980. Tetrahedon Letters. New York: Pergamon Press.
Harvard
T. Stephen, . (1980). Tetrahedon Letters. New York: Pergamon Press.
MLA
T. Stephen, . Tetrahedon Letters. New York: Pergamon Press. 1980.