Masters, William H.
Harper Perennial 1994, 1994
Buku Teks SO
Mosby, Elsevier, 2006
Buku Referensi
editors, Katherine E. Henderson, Thomas J. Branski, Perry E. Bickel
Lippincott Wiiliams & Wilkins, 2005
Buku Teks SO
Havelock, Ronald G.
University of Michigan, 1973
Buku Teks SO
Kluwer Law & Taxation Publishers, 1994
Buku Teks