Buku Teks
Buku Teks
Kennedy, John F. (John Fitzgerald), 1917-1963
Harper & Row, 1955
Buku Teks SO
Asean -Ec Energy Management Training and Research Centre, 1993,
Buku Referensi
edited by Brett A. Lidbury, Suresh Mahalingam
CRC Pres/Taylor & Francis Group, 2009
Buku Teks SO