Bruce, R. Robert
Hodder & Stoughton, 1994
Buku Teks
Harden, Ronald M.
Churchill Livingstone, 2012
Buku Teks SO
Sutanto Atmosumarto
Routledge, 1994
Buku Teks SO
Cleophas, Ton J.
Springer International Publishing, 2015
eBooks
Dubin, Fraida
Cambridge University Press, 1986
Buku Teks SO