Cita APA (7th ed.)
Freed, P. E. (1979). Towers to eternity. Sceptre Books.
Cita Chicago (17th ed.)
Freed, Paul E. Towers to Eternity. Nashville: Sceptre Books, 1979.
Cita MLA (9th ed.)
Freed, Paul E. Towers to Eternity. Sceptre Books, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.