6William Apgar and Emily J. Whiting. An Emerging Tool for Affordable Housing Finance Joint Center for Housing Studies. Harvard University. 2003.
7Kent W. Colton. Housing Finance in US: The Transformation of the US Housing Finance System. Joint Center for Housing Studies. Harvard University. 2002.
8William Apgar and Emily J. Whiting. An Emerging Tool for Affordable Housing Finance. Joint Center for Housing Studies, Harvard University, Feb., 2003.