APA

Organisation for Economic Co-operation and Development, OECD, . (1990). Environmental policies for cities in the 1990s. Paris: Organisation for Economic Co-operation and Development.

Chicago

Organisation for Economic Co-operation and Development, OECD, . 1990. Environmental policies for cities in the 1990s. Paris: Organisation for Economic Co-operation and Development.

Harvard

Organisation for Economic Co-operation and Development, OECD, . (1990). Environmental policies for cities in the 1990s. Paris: Organisation for Economic Co-operation and Development.

MLA

Organisation for Economic Co-operation and Development, OECD, . Environmental policies for cities in the 1990s. Paris: Organisation for Economic Co-operation and Development. 1990.