Rajchman, John
MIT Press, 2000
Buku Teks SO
Bell, Jeffrey A
Edinburgh University Press Ltd, 2016
Buku Teks SO
Bell, Jefrey A.
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Buku Teks SO
edited by Matthew Carlin and Jason Wallin
Bloomsbury Academic, 2014
Buku Teks
Furnas, C.C.
Time Incorporated, 1966
Buku Referensi