# Source register — Portfolio Service Receipt

Checked September 20, 2026. These sources support narrow principles, not any real modSTORAGE practice, contract term, vendor result or private-sector legal requirement.

| ID | Primary source and URL | Used for | Limitation |
| --- | --- | --- | --- |
| PSR-SRC-001 | Federal Trade Commission, [Scams and Your Small Business: A Guide for Business](https://www.ftc.gov/business-guidance/resources/scams-your-small-business-guide-business) | Clear purchase/invoice approval procedures, close invoice checks and fake-invoice risk. | FTC general small-business advice; not evidence of a fraud event in the fictional or real portfolio. Web readback succeeded; direct command-line request returned 403, so the source was checked through the browser-accessible official page. |
| PSR-SRC-002 | U.S. Government Accountability Office, [The Green Book: Standards for Internal Control in the Federal Government](https://www.gao.gov/greenbook) | Distinguishing operational, reporting and internal-control objectives; 2025 edition effective fiscal year 2026. | Federal agency standard. This article does not assert private self-storage compliance, audit certification or applicability. Web readback succeeded; direct command-line request returned 403. |
| PSR-SRC-003 | Federal Acquisition Regulation, [32.905 Payment documentation and process](https://www.acquisition.gov/far/32.905) | Example of a formal separation between receiving/acceptance documentation and invoice payment review. | Applies to federal acquisition, not automatically to a private operator; cited as a clearly bounded analogy only. Official direct and web readbacks returned HTTP 200. |

The receipt design and twelve-site fictional arithmetic are authored instructional synthesis. The example is not a customer case, performance measure, vendor evaluation or regulatory finding. No statistic about self-storage invoice errors or financial savings is asserted.