Callaghan, Barry
General Publishing Co. Limited, 1978
Buku Teks SO
Clarke, Marcus
Hale & Iremonger, c1983
Buku Teks SO
O`Callaghan, Paul W.
Pergamon Press , 1978
Buku Teks SO
Cambridge University Press, 2007
eBooks
Brown, Stephen W.
Medical economics books, 1986
Buku Teks SO