Soegondo
Gadjah Mada University Press , 1998
Buku Teks
Sri Sutjiatiningsih
Departemen Pendidikan dan Kebudayaan RI, 1999
Buku Teks
Comfort, Jeremy
Oxford University Press, 1994
Buku Teks
Smith, Jennifer
Macmillan, 1982
Buku Teks
Clynes, A.J.
International Development Program of Australian Universities, 1985
Buku Teks