APA
United Nations. Technical Co-Operation For Development (Deptt Of-), United Nations. Technical Co-Operation For Development (Deptt Of-), . (1991). Ground water in Western and Central Europe. New: York United Nation U S A.
Chicago
United Nations. Technical Co-Operation For Development (Deptt Of-), United Nations. Technical Co-Operation For Development (Deptt Of-), . 1991. Ground water in Western and Central Europe. New: York United Nation U S A.
Harvard
United Nations. Technical Co-Operation For Development (Deptt Of-), United Nations. Technical Co-Operation For Development (Deptt Of-), . (1991). Ground water in Western and Central Europe. New: York United Nation U S A.
MLA
United Nations. Technical Co-Operation For Development (Deptt Of-), United Nations. Technical Co-Operation For Development (Deptt Of-), . Ground water in Western and Central Europe. New: York United Nation U S A. 1991.