APA
T. Stephen, . (1977). Tetrahedon Letters. New York: Pergamon Press.
Chicago
T. Stephen, . 1977. Tetrahedon Letters. New York: Pergamon Press.
Harvard
T. Stephen, . (1977). Tetrahedon Letters. New York: Pergamon Press.
MLA
T. Stephen, . Tetrahedon Letters. New York: Pergamon Press. 1977.