Colin Buchanan and Partners., Kerrigan, M., & Northern Ireland. Department of the Environment. (2011). Building on tradition: A sustainable design guide for the Northern Ireland countryside : supplementary planning guidance to PPS21. Department of the Environment.

Colin Buchanan and Partners., et al. Building on Tradition: A Sustainable Design Guide for the Northern Ireland Countryside : Supplementary Planning Guidance to PPS21. Department of the Environment, 2011.