The website of the International Committee of the Red Cross has a wealth of material in this area. Of particular importance is its work on healthcare in danger: healthcareindanger.org/resource-centre.
Médecins Sans Frontières has decades of experience providing medical humanitarian aid during conflict and disasters. www.msf.org.uk.
The Sphere Handbook is an internationally recognised set of common principles and universal minimum standards in life-saving areas of humanitarian response. www.sphereproject.org.
The World Medical Association has issued many guidelines on medical ethics in conflict and crises. WMA policies and declarations can be found here: www.wma.net/policy.
Next card: General guidelines (Appendix A)