Donald Freeman and Jack C. Richardsand
Cambridge Cambridge University Press 1996
Buku Teks SO
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 SO
Shreeve, Daniel F.
Springer, 2012
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