Barnes, Donald L.
Burgess, 1969
Buku Teks SO
Richards, Jack C.
Cambridge University Press, 2015
Buku Teks SO
edited by M.G. Hesse
North-Holland, 1975
Buku Teks SO
Richards, Jack C.
Cambridge University Press, 2006
Buku Teks SO
Moore, Kenneth D
McGraw--Hill, 2007
Buku Teks