1. ICS, available at https://www.ics-shipping.org/shipping-fact/shipping-and-world-trade-global-supply-and-demand-for-seafarers/
2. IMO, available at https://www.imo.org/en/OurWork/HumanElement/Pages/SafetyManagement-Default.aspx
3. Overcoming Obstacles to Implementing SMS
4. F. J. Lappalainen, J. Kuronen, and U. Tapaninen, Valuation of the ISM Code in the Finnish shipping companies, Journal of Maritime Research, 9(1), 23–32 (2012)
5. Human Factors and Safety Culture in Maritime Safety (revised)