Kenen, Peter B.
Institute for International Economics , 2001
Buku Teks SO
Lowenfeld, Andreas F.
Matthew Bender, 1983
Buku Teks
Marting, Elizabeth
International Management Association, 1957
Buku Teks SO
Perbadanan Kemajuan Kraftangan Malaysia, 1999
Buku Referensi
Williams, Phil
Thomson Wadsworth, 2006
Buku Teks SO