Catatonia: American Psychiatric Association Resource Document.
Wilson JE, Oldham MA, Francis A, Perkey D, Kramer E, Jiang S, Yoon J, Beach S, Fricchione G, Gunther M, Ha J, Luccarelli J, Rosen J, Hamlin D, Dragonetti JD, Gerstenblith A, Stewart AL, Sole J, Bourgeois JA.