Djoko Sumitro
Gadjah Mada University Press, 1990
Buku Teks SO
Farrell, Thomas S.C.
Corwin Press, 2006
Buku Teks SO
Brian Paltridge, editor; Sue Starfield, editor
Wiley-Blackwell, 2013
Buku Teks
Clynes, A.J.
International Development Program of Australian Universities, 1985
Buku Teks SO
Clymer, Theodore
Burdett, 1984
Buku Teks SO