diff --git a/Document/content/References.md b/Document/content/References.md
index a565330..4dfcc0b 100644
--- a/Document/content/References.md
+++ b/Document/content/References.md
@@ -22,3 +22,4 @@
 \[20\] Yu, S. (2023). *Cyber Defense Matrix: The Essential Guide to Navigating the Cybersecurity Landscape.* Wiley. ISBN: 978-1119895183. Available from: [https://www.wiley.com/en-us/Cyber+Defense+Matrix%3A+The+Essential+Guide+to+Navigating+the+Cybersecurity+Landscape-p-9781119895183](https://www.wiley.com/en-us/Cyber+Defense+Matrix%3A+The+Essential+Guide+to+Navigating+the+Cybersecurity+Landscape-p-9781119895183)  
 \[21\] OWASP Agentic Security Initiative. (2025, February 17). *Agentic AI – Threats and Mitigations*. OWASP Generative AI Security Project. Retrieved from [https://genai.owasp.org/resource/agentic-ai-threats-and-mitigations/](https://genai.owasp.org/resource/agentic-ai-threats-and-mitigations/)  
 \[22\] OWASP Agentic Security Initiative. “Multi-Agentic System Threat Modeling Guide v1.0.” OWASP Generative AI Security Project. April 23, 2025\. [https://genai.owasp.org/resource/multi-agentic-system-threat-modeling-guide-v1-0/](https://genai.owasp.org/resource/multi-agentic-system-threat-modeling-guide-v1-0/)
+\[23\] Jim Hoagland et al. "Prompt Injection Taxonomy for AI Applications." Pangea Security, 2024\.  [https://pangea.cloud/securebydesign/aiapp-pi-taxonomy/](https://pangea.cloud/securebydesign/aiapp-pi-taxonomy/)