BKKBN DKI Jakarta UPT PDJI, 1987
Buku Referensi
Yohanes Krisnawan, author
Institut Studi Arus Informasi, 1997
Buku Teks
Antar Kota, 1992
Buku Teks
National Council of Farmer Cooperatives , 1992
Buku Teks
Quelch, John A., author
Addison-Wesley, 1991
Buku Teks