APA

(1999). 1979 Convention on Long-range Transboundary Air Pollution and its 1998 protocols on persistent organic pollutants and heavy metals. New York: United Nations.

Chicago

1999. 1979 Convention on Long-range Transboundary Air Pollution and its 1998 protocols on persistent organic pollutants and heavy metals. New York: United Nations.

Harvard

(1999). 1979 Convention on Long-range Transboundary Air Pollution and its 1998 protocols on persistent organic pollutants and heavy metals. New York: United Nations.

MLA

1979 Convention on Long-range Transboundary Air Pollution and its 1998 protocols on persistent organic pollutants and heavy metals. New York: United Nations. 1999.