Gaya APA

The Official American Board of Medical Specialties (ABMS) Directory of board certified Medical Specialists Vol.5. (1992). Illinois: American Board of Medical Specialties Research and Education Foundation.

Gaya MLA

The Official American Board of Medical Specialties (ABMS) Directory of board certified Medical Specialists Vol.5. 4th ed. Illinois: American Board of Medical Specialties Research and Education Foundation, 1992. print.