Organisation for Economic Co-operation and Development
OECD, 1974
Buku Teks
Meinel, Aden B., author
Addison-Wesley, 1979
Buku Teks
edited by Thomas Easton
McGraw-Hill, 2012
Buku Teks
Artikel Jurnal
Asean -Ec Energy Management Training and Research Centre, 1997,
Buku Referensi