Rose, Dennis J
The Law Book Company Limited, 1967
Buku Teks
Coxhead, Elizabeth, 1909-1979
The British Council by Longmans, Green, 1962
Buku Teks
Eliots, John, author
Connecticut Greenwood Press , 1980
Buku Teks
Leet, Lewis Don, author
Dell, 1964
Buku Teks
Eddy Rosfiati, author
2015
UI - Tugas Akhir