edited by Donald Watson
McGraw-Hill , 1979
Buku Teks
O`Callaghan, Paul W.
Pergamon Press , 1978
Buku Teks
Asean -Ec Energy Management Training and Research Centre, 1997,
Buku Referensi
Roytman, M. Ya
New Delhi: Amerind, 1975
Buku Teks
Traister, John E.
McGraw-Hill, 1985
Buku Teks