Actually comes from all of these.
14 CFR part 1 Definitions and Abbreviations
14 CFR part 39 Airworthiness Directives
14 CFR part 43 Maintenance, Preventive Maintenance, Rebuilding, and Alteration
14 CFR part 61 Certification: Pilots, Flight Instructors, and Ground Instructors
14 CFR part 71 Designation of Class A, B, C, D, and E Airspace Areas; Air Traffic Service Routes
14 CFR part 91 General Operating and Flight Rules
49 CFR part 830 Notification and Reporting of Aircraft Accidents
AC 00-45 - Aviation Weather Services
AC 00-6 - Aviation Weather
AC 20-43 - Aircraft Fuel Control
AC 60-22 - Aeronautical Decision Making
AC 90-48 - Pilots` Role in Collision Avoidance
AC 91-13 - Cold Weather Operation of Aircraft
Aeronautical Information Manual
Airport/Facility Directory
FAA-H-8083-1 - Aircraft Weight and Balance Handbook
FAA-H-8083-2 - Risk Management Handbook
FAA-H-8083-25 - Pilot`s Handbook of Aeronautical Knowledge
FAA-H-8083-3A - Airplane Flying Handbook
FAA-H-8261-1 - Instrument Procedures Handbook
Sectional Aeronautical Chart
I recommend getting a study program specifically for the written test(such as Gleim, Dauntless, King Schools, etc) as opposed to trying to obtain the information from text books like you do in high school/college courses.