What sources did you have in mind?
Here is a longer list of ideas of sourcing you can use to include in your files
Examples of cool records to add:
Account books
Agreements (examples: legal, sharing, land, marriage, donation, rental)
Albums
Announcements
Applications
Apprentice papers
Autograph books
Audio recordings of their voice (both haunting and amazing to hear them again)
Awards
Baby books
Banking or financing documents (hard to find but can show alot more than you may care to know)
Body processing papers (air plane conveyance, preservations, cremations, donation)
Baptism records
Bibles
Birth records
Blessings
Bonds
Interment or cemetery records (grave stone markers, maps, ownership proofs)
Census
Certificates
Christenings
Church records
Citizenship
Civil records
Coat of arms
Confirmations
Contracts
Death announcements or death records
Debarkation papers
Deeds
Diaries
Discharge papers
Divorce records
Documents
Ecclesiastical
Embarkment or proof of travel papers
Emmigration papers
Engagements
Enlistment papers
Employment records
Election records or lists
Estate papers
Family records
Family crests, signets, rings, seals
Fraternity
Funeral cards
Genealogy records
Government ID
Graduation
Histories
Hobbies
Immigration papers
Induction papers
Insurance records
Journals
Keepsakes
Land titles or land records or address listings
Legal papers (arrest records, prison time, sentencing decisions, tickets, payroll withholding requests, child support, alimony, enforceable action, living association, adjudications, public trials, )
Letters
Life stories
Lodge records
Manuscripts
Marriage records
Memorials
Military records
Mortgages
Naturalization papers
Newspaper articles
Obit
Ordinations
Orphan records
Passenger papers
Passports
Pension papers
Periodicals
Pictures and videos
Receipts
Recipes
Record books
Religious milestone papers (baptism, bat(/bar)mistva, etc.)
School report cards
School graduation credentials (certificate, degree, diploma, masters)
Scrapbooks
Stock certificates (paper or expired- these are still very cool)
Tax papers or results
Telephone listings
Traffic tickets
Union papers
Video recording of the person (super cool to jog memories)
Will & Estate or Probate
Did I miss anything?- please tell me so I can share it.