ICMJE Clinical Trial Registration
ICMJE - Questions about Clinical Trial Registration
ICMJE Recommendations for the Conduct, Reporting, Editing and Publication of Scholarly Work in Medical Journals
Note: ICJME and many other journals have information regarding clinical trial registration in their Instructions for Authors section.
Center for Drug Evaluation and Research; US Food and Drug Administration. Guidance for industry information program on clinical trials for serious or life-threatening diseases and conditions. Available Here