Maier, Norman R.F.
John Wiley & Sons, 1960
Buku Teks
Briggs, Charles L.
Cambridge University Press, 1997
eBooks
Fiza Fitra Dini
Universitas Indonesia, 2009
UI - Tesis Open
Andre Syahreza
Gagas Media, 2008
Buku Teks
Fletcher, John
Duckworth, 1973
Buku Teks