Mina Elfira
Fakultas Ilmu Pengatahuan Budaya Universitas Indonesia, 1992
UI - Laporan Penelitian
Swan, Michael
Longmans, 1950
Buku Teks SO
Matthiessen, F.O.
Oxford University Press, 1944
Buku Teks SO
Swan, Michael
Longmans Green, 1969
Buku Teks SO
James, Henry, 1843-1916
Harper & Row, 1966
Buku Teks