APA-viite

Gregersen Hans. (1989). People and trees: The role of social forestry in sustainable development. The World Bank.

Chicago-tyylinen lähdeviittaus

Gregersen Hans. People and Trees: The Role of Social Forestry in Sustainable Development. Washington D C: The World Bank, 1989.

MLA-viite

Gregersen Hans. People and Trees: The Role of Social Forestry in Sustainable Development. The World Bank, 1989.