BKPM, 1991
Buku Teks
ASEAN Secretariat, 1999
eBooks
by The Central Bank of Indonesia (Bank Negara Indonesia Unit I)
The Central Bank of Indonesia (Bank Negara Indonesia Unit I), 1962
Buku Teks SO
Fatouros, A. A.
Columbia University Press, 1962
Buku Teks SO
Medhurst, David
Blackwell Scientific Publications, 1994
Buku Referensi