Whitten, D.G.A., 1921-
The Penguin Dictionary of geology
Penguin Books, 1972
 Buku Referensi
Whitten, D.G.A., 1921-
The penguin dictionary of geology/D.G.A.Whitten,J.R.V.Brooks
Victoria Penguin Books 1972,
 Buku Referensi
Himus, Godfrey W.
A dictionary of geology
Harmondsworth, Middlesex, 1954
 Buku Referensi
Bannock, G.
The Penguin dictionary of economics
Penguin Books, 1974
 Buku Referensi
Thomas, Merlin
The Penguin French dictionary
Penguin Books, 1985
 Buku Referensi