Battersby, Albert
Sales forecasting
Penguin Books, 1968
 Buku Teks
Keay, Frederick
Marketing and sales forecasting
Pergamon Press, 1972
 Buku Teks
Hamper, Robert J.,
Strategic market planning/ Robert J.Hamper
NTC Bussiness Book, 1992
 Buku Teks
Chisnall, Peter M
Strategic industrial marketing
Prentice-Hall, 1989
 Buku Teks
Linda Stepvhanie
Peramalan penjualan produk susu bayi dengan metode grey system theory dan neural network = Sales forecasting of baby milk with grey system theory and neural network
Fakultas Teknik Universitas Indonesia, 2012
 UI - Skripsi Open