Soegondo
Gadjah Mada University Press, 1993
Buku Teks
Sri Sutjiatiningsih
Departemen Pendidikan dan Kebudayaan RI, 1999
Buku Teks SO
Comfort, Jeremy
Oxford University Press, 1994
Buku Teks SO
Smith, Jennifer
Macmillan, 1982
Buku Teks SO
Clynes, A.J.
International Development Program of Australian Universities, 1985
Buku Teks SO