Hadari Nawawi, author
Gadjah Mada University Press, 1993
Buku Teks
Hadari Nawawi
Gadjah Mada University Press, 2008
Buku Teks
Blanchard, Kenneth H., author
Fontana , 1983
Buku Teks
Moriaki, Tsuchiya, author
LTCB International Library Foundation, 1997
Buku Teks
Pacetta, Frak
Prenhallindo, 1997
Buku Teks