Cita APA (7th ed.)
Porter David. (1987). Children at risk (ed.). Crossway Books.
Cita Chicago (17th ed.)
Porter David. Children at Risk. ed. Illinois: Crossway Books, 1987.
Cita MLA (9th ed.)
Porter David. Children at Risk. ed. Crossway Books, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.