Bannock, G.
The Penguin dictionary of economics
Penguin Books, 1974
 Buku Referensi
Thomas, Merlin
The Penguin French dictionary
Penguin Books, 1985
 Buku Referensi
Bannock, G.
The Penguin dictionary of economics
Allen Lane / The Viking Press, 1979
 Buku Referensi
Bryson, Bill
The Penguin dictionary for writers and editors
Penguin Books, 1994
 Buku Referensi
Whitten, D.G.A., 1921-
The Penguin Dictionary of geology
Penguin Books, 1972
 Buku Referensi