Sustainability lessons from private finance and similar private initiatives / R. Garwood, S. Logan, K. Mills, N. Willoughby, 2002. - 10 p. - Текст : непосредственный.
Rao S. Sustainability indicators for utilities / S.Rao,H.Sargant,K.Mills, 2001. - 8 p. - Текст : непосредственный.