APA
"United Nations . T. C. F. D. (. O., "United Nations . T. C. F. D. (. O., . (1990). Ground water in Eastern and Northern Europe. New: York United Nations U S A.
Chicago
"United Nations Technical Co-Operation For Development (Deptt Of-)", "United Nations Technical Co-Operation For Development (Deptt Of-)", . 1990. Ground water in Eastern and Northern Europe. New: York United Nations U S A.
Harvard
"United Nations . T. C. F. D. (. O., "United Nations . T. C. F. D. (. O., . (1990). Ground water in Eastern and Northern Europe. New: York United Nations 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 Eastern and Northern Europe. New: York United Nations U S A. 1990.
