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6.303-1 Requirements. - Acquisition.GOV
Sole Source - Justification and Approval - AcqNotes
Types of contracts | U.S. Small Business Administration
The Difference Between a Single Source & Sole Source for a Contract
Sole Source Procurement: A Guide to Single-Source Acquisitions
What Are Sole Source Contracts? - Winvale
Understanding Sole Source Contracts in Government Procurement
Exploring Sole-Source Contracts: A Shortcut to Federal Success?
What is a Sole Source Contract? - GovBrew