Chambers 20th century dictionary
edited by E.M. Kirkpatrick ; assistant editors, C.M. Schwarz ... [and others]
Chambers, 1983
 Buku Referensi
Biographical dictionary of twentieth-century philosophers
edited by Stuart Brown, Diane Collinson, Robert Wilkinson
Roudledge, 1996
 Buku Referensi
Teed, Peter
A dictionary of twentieth century history 1914-1990
Oxford University Press , 1992
 Buku Referensi
Cohen, J.M. (John Michael), 1903-1989
The Penguin dictionary of twentieth-century quotations
Viking, 1993
 Buku Referensi
Thwaite, Anthony
Twentieth-century English poetry : an introduction
Heineman, 1984
 Buku Teks