Clark, James Joseph, 1957
Kluwer, 1990
Buku Teks SO
Mitchell, H.B.
[Springer, Springer], 2012
eBooks
edited by Martin E. Liggins, David L. Hall, James Llinas
CRC Press, 2009
Buku Referensi
Dimas Julian M.R.
Universitas Indonesia, 2006
UI - Skripsi Membership
Pierson, Lillian
John Wiley & Sons, 2017
Buku Teks SO