Whittmore, Andrew (2 February 2015). "How Planners Use Planning Theory". Planetizen. Retrieved 24 April 2015. citing Whittemore, Andrew H. (2014). "Practitioners Theorize, Too Reaffirming Planning Theory in a Survey of Practitioners' Theories". Journal of Planning Education and Research. 35 (1): 76–85. doi:10.1177/0739456X14563144. S2CID144888493.
Whittmore, Andrew (2 February 2015). "How Planners Use Planning Theory". Planetizen. Retrieved 24 April 2015. citing Whittemore, Andrew H. (2014). "Practitioners Theorize, Too Reaffirming Planning Theory in a Survey of Practitioners' Theories". Journal of Planning Education and Research. 35 (1): 76–85. doi:10.1177/0739456X14563144. S2CID144888493.
"Professional standards". Royal Institute of Town Planners. Royal Town Planning Institute. Retrieved 20 July 2017.
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Whittmore, Andrew (2 February 2015). "How Planners Use Planning Theory". Planetizen. Retrieved 24 April 2015. citing Whittemore, Andrew H. (2014). "Practitioners Theorize, Too Reaffirming Planning Theory in a Survey of Practitioners' Theories". Journal of Planning Education and Research. 35 (1): 76–85. doi:10.1177/0739456X14563144. S2CID144888493.