Hahn, R. W. (1989). A primer on environmental policy design. Harwood Academic Pub.
Lua i Stíl Chicago (17ú heag.)Hahn, Robert W. A Primer on Environmental Policy Design. Chur: Harwood Academic Pub, 1989.
Lua MLA (9ú heag.)Hahn, Robert W. A Primer on Environmental Policy Design. Harwood Academic Pub, 1989.
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