Donald Freeman and Jack C. Richardsand
Cambridge Cambridge University Press 1996
Buku Teks
editors, Robert S. Feder, Christopher J. Rapuano
Lippincott Williams & Wilkins, 2007
Buku Referensi
Greenstein, Caren E.
Wolters Kluwer, 2011
Buku Referensi
Meras, Edmond A.
Harper & Row, 1962
Buku Teks
Shreeve, Daniel F.
[Springer, Springer], 2012
eBooks