Gaya APA

LUMSDEN, G, I. (1992). Geology and the environment in western Europe: 2 coordinated statement by the western European geological surveys . : Clarendon Press.

Gaya MLA

LUMSDEN, G., Innes. "Geology and the environment in western Europe: 2 coordinated statement by the western European geological surveys". : Clarendon Press, 1992. Buku.