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
Whitten, D.G.A., 1921-
The Penguin Dictionary of geology
Penguin Books, 1972
 Buku Referensi
The Penguin dictionary of chemistry
edited by D.W.A. Sharp
Penguin Books, 1983
 Buku Referensi