Type such phrases as Participation of Humans in Research into your favourite search engine to find large numbers of sites. Those below will provide a good starting point. The Participation of Humans in Research would form a good topic for a student paper, debate or class project.

Ethical Participation of Humans in Research
Ethics Tutorial	This extensive tutorial from McMaster University describes the ethical issues involved in research involving human participants.
Tri-Council Policy Statement	This Tri-Council Policy Statement: Ethical Conduct for Research Involving Humans describes the policies of the Canadian Institutes for Health Research (CIHR), the Natural Sciences and Engineering Research Council (NSERC), and the Social Sciences and Humanities Research Council (SSHRC). Youth Science Canada requires that these policies be followed in all Science Fairs. This is a technical document written for professionals, not for school students.