Systematically Reviewing the Rigour of Immersive Virtual Reality Research in STEM Education: A Deep Dive into Threats to Internal Validity - Amédee Marchand Martella; Alyssa P. Lawson; Ronald C. Martella; Kristen LaBonte; Fangzheng Zhao; Cynthia Y. Delgado; Mitchell E. Munns; Ashleigh Wells LeRoy; Justin A. Gluck; Richard E. Mayer (Journal of Computer Assisted Learning, 2026)