The Declaration of Helsinki was adopted in 1964 and has been amended six times, most recently at the United Nations General Assembly in October 2008. This is now the only official version and it supersedes all previous ones, which should not be used or cited, except for historical purposes.
Testing treatments: Better research for better health care. This book, published by the James Lind Library, is a collection of essays addressing the question: How do we know whether a particular drug, therapy, or operation really works, and how well?
Pautas éticas internacionales sobre investigación en seres humanos (International Guidelines on Bioethics), Acta Bioethica 2004; 10(1), published in SciELO.