Giddings, J. Calvin
John Wiley & Sons, 1991
Buku Teks SO
edited by Otto Neurath, Rudolf Carnap and Charles Morris
University of Chicago Press, 1955
Buku Referensi
edited by Felix Finster ... [and others]
Springer, 2012
eBooks
Williams, Malcolm, 1953-
Routledge, 2000
Buku Teks SO
Hicks, John R.
The Clarendon Press, 1952
Buku Teks