U.S. Dept of Veteran Affairs : Psychological First Aid (PFA) Manual
WHO Psychological first aid – Guide for field workers
Novellus Solutions – Psychological safety or trust in competence: The Costa Concordia case
University of Twente – Antecedents of Psychological Safety in the Maritime Industry – Grimm (2020)
LeaderFactor – The Four Stages of Psychological Safety-Behavioral Guide