APA

Commonwealth Conference on Development and Human Ecology, . (1991). Human Ecology, Environmental Education and Sustainable Development: Report of the Ninth Commonwealth Conference on Development and Human Ecology. London: Commonwealth Human Ecology Council ; Edinburgh : University of Edinburgh.

Chicago

Commonwealth Conference on Development and Human Ecology, . 1991. Human Ecology, Environmental Education and Sustainable Development: Report of the Ninth Commonwealth Conference on Development and Human Ecology. London: Commonwealth Human Ecology Council ; Edinburgh : University of Edinburgh.

Harvard

Commonwealth Conference on Development and Human Ecology, . (1991). Human Ecology, Environmental Education and Sustainable Development: Report of the Ninth Commonwealth Conference on Development and Human Ecology. London: Commonwealth Human Ecology Council ; Edinburgh : University of Edinburgh.

MLA

Commonwealth Conference on Development and Human Ecology, . Human Ecology, Environmental Education and Sustainable Development: Report of the Ninth Commonwealth Conference on Development and Human Ecology. London: Commonwealth Human Ecology Council ; Edinburgh : University of Edinburgh. 1991.