For organ trafficking issue

Check out COFS (Coalition for Organ Failure Solutions), especially the tab "About organ trafficking" and the two links provided.
Coalition for Organ Failure Solutions

This report by the OSCE (Office for Security and Co-operation in Europe) on organ trafficking - you'll need to download the file.
OSCE Report

The website for the UNRIC (UN Regional Information Center) has a good article on it: 

UNRIC website

Either check out the WHO or this article from the Guardian (a UK paper) about its report on organ trafficking:
Guardian Article on Organ Trafficking

Here is another MUN conference from Boston, USA, that also covered this issue. They look like they have a lot of resources, too.
Human Organ Trafficking

Some other organizations to check out: WHO, UNODC, UNDP, Human Rights Watch, Blue Heart Campaign, Red Cross, IHRA, or the Asian Center for Human Rights