APA
UNITED NATIONS I. E. A. S. A. (. o., UNITED NATIONS I. E. A. S. A. (. o., . (1991). COncepts of methods of invironment statistics of natural environment. New York: United Nations.
Chicago
UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL AFFAIRS (Departments of--), UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL AFFAIRS (Departments of--), . 1991. COncepts of methods of invironment statistics of natural environment. New York: United Nations.
Harvard
UNITED NATIONS I. E. A. S. A. (. o., UNITED NATIONS I. E. A. S. A. (. o., . (1991). COncepts of methods of invironment statistics of natural environment. New York: United Nations.
MLA
UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL AFFAIRS (Departments of--), UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL AFFAIRS (Departments of--), . COncepts of methods of invironment statistics of natural environment. New York: United Nations. 1991.
