µ¦¦³»
¤ª·
µµ¦Â¨³Á°¨µª·
´
¥¤®µª·
¥µ¨´
¥´
¬·
¦´Ê
¸É
19
¦³Î
µe
2552
Ullman, E.L.,1980. “Geography as Spatial Interaction” in
Geography as Spatial Interaction
. Ronald R. Boyce(ed.)
Seattle: University of Washington Press. pp. 13-27.