Books:

What counts: social accounting for nonprofits and cooperatives
Jack Quarter; Laurie Mook; Betty Jane Richmond
find at any library: http://www.worldcat.org/oclc/166886547

Who benefits from the nonprofit sector?
By Charles T. Clotfelter
find at any library: http://www.worldcat.org/oclc/243737819

Forces for good: the six practices of high-impact nonprofits
By Leslie R. Crutchfield, Heather McLeod Grant: http://www.forcesforgood.net/
find at any library: http://www.worldcat.org/oclc/144769378

Can philanthropy solve the problems of civil society? / Bruce Sievers.
find at any library: http://www.worldcat.org/oclc/34051871&referer=brief_results
browse 1st fifteen pages in this digital collection:
http://indiamond6.ulib.iupui.edu/cdm4/document.php?CISOROOT=/PRO&CISOPTR=32192&REC=20

Scholarly Article:

Scaling Social Impact Strategies for spreading social innovations
By Gregory Dees, Beth Battle Anderson, and Jane Wei-skillern
(PDF) http://www.caseatduke.org/documents/scaling_social_impact.pdf