Karstens, S.A.M.; Bots, P.W.G.; Slinger, J.H. (2007). Spatial boundary choice and the views of different actors. Environ. Impact. Asses. Rev. 27(5): 386-407. http://dx.doi.org/10.1016/j.eiar.2007.02.002, meer
Karstens, S.A.M. (2009). Bridging boundaries: making scale choices in multi-actor policy analysis on water management. PhD Thesis. IOS Press: Amsterdam. ISBN 9781607500513. 316 pp., meer
