R. Perkel

发表

R. Enck, L. Collins, C. Haines, 2007, American Family Physician.

L. Collins, C. Haines, R. Perkel, 2009, American family physician.

R. Perkel, G. P. Sholevar, 1990, General hospital psychiatry.

R. Perkel, Netra M. Thakur, 2002, Primary care.