Platt, John
Oxford University Press, 1980
Buku Teks
Oriza Septiyandra
2017
UI - Makalah dan Kertas Kerja
Hoskins, R.F.
Ellis Horwood, 1979
Buku Teks
Dodge, Clayton W.
Prentice-Hall, 1966
Buku Teks
Bernard, Chester I.
Harvard University Press , 1966
Buku Teks