Blalock, Hubert M., author
Rajawali, 1987
Buku Teks
Rianto Adi, author
Arcan, 1991
Buku Teks
Mayer, Robert R., author
Rajawali, 1984
Buku Teks
Handari Nawawi, author
Gadjah Mada University Press, 1991
Buku Teks
Goode, William J., author
Usaha Nasional, 1951
Buku Teks