Ensuring domestic security : issues and potential costs ; hearing before the Committee on the Budget, House of Representatives, One Hundred Seventh Congress, first session, hearing held in Washington, DC, November 7, 2001

Strategic budgeting : risk management principles can help DHS allocate resources to highest priorities ; statement of David M. Walker, ..., testimony before the Subcommittee on Management, Integration, and Oversight, Committee on Homeland Security, House of Representatives

Walker, David M., (2005)

Federal budget : opportunities for oversight and improved use of taxpayer funds ; statement of David M. Walker, ..., testimony before the Committee on the Budget, US House of Representatives

Walker, David M., (2003)

Why budgets matter : budget policy and American politics

Ippolito, Dennis S., (2015)