APA
,, . (1997). UNEP environmental law training manual. United Kingdom: United Nations Environment Programme.
Chicago
,, . 1997. UNEP environmental law training manual. United Kingdom: United Nations Environment Programme.
Harvard
,, . (1997). UNEP environmental law training manual. United Kingdom: United Nations Environment Programme.
MLA
,, . UNEP environmental law training manual. United Kingdom: United Nations Environment Programme. 1997.