[publisher not identified], [date of publication not identified]
Buku Teks
Poot, Huib
Gadjah Mada University Press, 1990
Buku Teks
Kementerian Perdagangan RI, Jl. M. I. Ridwan Rais no. 5
Majalah, Jurnal, Buletin
Kompassindo
Jakarta : Kompassindo, 1994,
Buku Referensi
Kompassindo, 1994
Buku Referensi