William E. Wetzel

Angels and Informal Risk Capital

William E. Wetzel, W. Wetzel, 1983 .

The informal venture capital market: Aspects of scale and market efficiency

William E. Wetzel, W. Wetzel, 1987 .

Angels and non-angels: Are there differences?

Jeffrey Sohl, J. Sohl, William E. Wetzel, 1994 .

Angels: personal investors in the venture capital market

Jeffrey Sohl, J. Sohl, William E. Wetzel, 1995 .