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