【作者(必填)】
James W. Harrington Jr.
【文题(必填)】
Producer Services Research in U.S. Regional Studies
【年份(必填)】
The Professional Geographer Volume 47, Issue 1, pages 87–96, February 1995
【全文链接或数据库名称(选填)】
http://onlinelibrary.wiley.com/doi/10.1111/j.0033-0124.1995.00087.x/abstract