Microsoft Access Database: Creating a Validation Rule in an Access Table
Jan's Access Tables & Queries: Validation
Working with Field Properties :: Hour 14. Power Table Techniques :: Part IV: Power Access Techniques :: Microsoft Office Access 2003 in 24 hours :: Microsoft Products :: eTutorials.org
Validation Rules for Access Tables - Codekabinett
Validation Rules for Access Tables - Codekabinett
How to set a data validation rule in Access - Quora
vba - How can you set a validation rule for a field to accept only 0.5 increments (Access 2010) - Stack Overflow