“The informal venture capital market: Aspects of scale and market efficiency”
Journal of Business Venturing, Volume 2, Issue 4, Autumn 1987, Pages 299-313
William E. Wetzel Jr.

“Angels and non-angels: Are there differences?”
Journal of Business Venturing, Volume 9, Issue 2, March 1994, Pages 109-123
John Freear, Jeffrey E. Sohl, William E. Wetzel Jr.

拜托达人们啦~~万分感谢！！