McLeod, Sam; Schapper, Jake H.M.; Curtis, Carey; Graham, Giles (February 2019). "Conceptualizing freight generation for transport and land use planning: A review and synthesis of the literature". Transport Policy. 74: 24–34. doi:10.1016/j.tranpol.2018.11.007. hdl:20.500.11937/71069. S2CID158794278.
McLeod, Sam; Schapper, Jake H.M.; Curtis, Carey; Graham, Giles (February 2019). "Conceptualizing freight generation for transport and land use planning: A review and synthesis of the literature". Transport Policy. 74: 24–34. doi:10.1016/j.tranpol.2018.11.007. hdl:20.500.11937/71069. S2CID158794278.
McLeod, Sam; Schapper, Jake H.M.; Curtis, Carey; Graham, Giles (February 2019). "Conceptualizing freight generation for transport and land use planning: A review and synthesis of the literature". Transport Policy. 74: 24–34. doi:10.1016/j.tranpol.2018.11.007. hdl:20.500.11937/71069. S2CID158794278.