Ludwing, A. M. (1980). Principles of clinical psychiatry. The Free Press.
Cita Chicago (17th ed.)Ludwing, Arnold M. Principles of Clinical Psychiatry. The Free Press, 1980.
Cita MLA (9th ed.)Ludwing, Arnold M. Principles of Clinical Psychiatry. The Free Press, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.