AASHTO, Strategic Highway Safety Plan, 2005.
https://store.transportation.org/

FHWA, MAP-21 Apportionment Fact Sheet
https://www.fhwa.dot.gov/map21/factsheets/apportionment.cfm

FHWA, HSIP Apportionment Notices
https://www.fhwa.dot.gov/legsregs/directives/notices/

FHWA, HSIP MAP-21 Fact Sheet
https://www.fhwa.dot.gov/map21/factsheets/hsip.cfm

FHWA, HSIP MAP-21 Reporting Guidance, February 13, 2013
https://www.fhwa.dot.gov/map21/guidance/guidehsipreport.cfm

FHWA, HSIP Online Reporting Tool
http://www.fhwa.dot.gov/legislative-safety-programs/hsip/hsip-online-reporting-tool

FHWA, HSIP National Summary Baseline Report 2009-2012
https://highways.dot.gov/safety/hsip/hsip-national-summary-baseline-report-2009-2012

2013 State HSIP Reports
http://www.fhwa.dot.gov/legislative-safety-programs/hsip/highway-safety-improvement-program-hsip-reporting