APA (7. basım) Alıntı

B & Helm, D. (1991). Economic Policy Towards The Environment (1. Edisyon.). Blackwell.

Chicago Style (17. basım) Atıf

B ve Dieter Helm. Economic Policy Towards The Environment. 1. Edisyon. Oxford: Blackwell, 1991.

MLA (9th ed.) Atıf

B ve Dieter Helm. Economic Policy Towards The Environment. 1. Edisyon. Blackwell, 1991.