Laurie, Ian C.
Chichester: John Wiley & Sons, 1979
Buku Teks
edited by Julian Custer
Clanrye International, 2018
Buku Teks
edited by Peter Roberts and Hugh Sykes
Sage, 2003
Buku Referensi
edited by Peter Roberts, Hugh Sykes
Sage Publications, 2003
Buku Referensi
Newnes-Butterworths, 1979
Buku Teks