9Monson Donald and Monson Astrid, The Development and Practice of Compensation and Betterment in Present English Planning Law [ J ]. Land Economics, Vol. 25, No. 2 ( may, 1949), 173 - 183.
10Buckland Jeffrey G. , The History and Use of Purchase of Development Rights in the United States [ J ]. Landseape and Urban Planning, Vol. 14 (1987), 237 -252.