Concise Oxford English dictionary
edited by Catherine Soanes and Angus Stevenson
Oxford University Press, 2006
 Buku Referensi
The oxford dictionary of current english
edited by Della Thompson
Oxford University Press, 1996
 Buku Referensi
Allan, Dave
Oxford placement test 1
Oxford University Press, 1992
 Buku Teks SO
Nisa Andini
Perwujudan konsep kewaktuan bahasa Indonesia dalam buku cerita dwibahasa Spiderman Saves the day/Spiderman menyelamatkan dunia
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2008
 UI - Skripsi Open
Kirkpatrick, Betty
The oxford paperback thesaurus an A-Z of synonyms
Oxford University Press, 1994
 Buku Referensi