National Science Foundation (2006). «Time to Degree of U.S. Research Doctorate Recipients». InfoBrief, Science Resource Statistics. NSF. 06-312: 7. Arquivado do original(PDF) em 8 de março de 2016 Under "Data notes" this article mentions that the J.D. is a professional doctorate.
San Diego County Bar Association (1969). «Ethics Opinion 1969-5». Consultado em 26 de maio de 2008. Under "other references" differences between academic and professional doctorates, and contains a statement that the J.D. is a professional doctorate
National Science Foundation (2006). «Time to Degree of U.S. Research Doctorate Recipients». InfoBrief, Science Resource Statistics. NSF. 06-312: 7. Arquivado do original(PDF) em 8 de março de 2016 Under "Data notes" this article mentions that the J.D. is a professional doctorate.