【作者(必填)】
William J. Coffey
【文题(必填)】
Producer Services Research in Canada
【年份(必填)】
The Professional Geographer Volume 47, Issue 1, pages 74–81, February 1995
【全文链接或数据库名称(选填)】
http://onlinelibrary.wiley.com/doi/10.1111/j.0033-0124.1995.00074.x/abstract