Harman, S.
DL Publication, 1977
Buku Teks SO
Carron, Andrew S.
Brookings Institution, 1982
Buku Teks
Howe, Sean
HarperCollins, 2012
Buku Teks SO
Kiki Syahnakri
Kompas Media Nusantara, 2013
Buku Teks
Siti Hawa Mohd., Datin Hjh
MPH Group Publishing Sdn Bhd, 2012
Buku Teks