APA (7th ed.) Citation

Helm. (1991). Economic policy towards the environment. Blackwell Publishers.

Chicago Style (17th ed.) Citation

Helm. Economic Policy Towards the Environment. UK: Blackwell Publishers, 1991.

MLA (8th ed.) Citation

Helm. Economic Policy Towards the Environment. Blackwell Publishers, 1991.

Warning: These citations may not always be 100% accurate.