Purdue University offers excellent online guides to APA and MLA styles, plus guides to the Chicago/Turabian Style and the American Medical Association Style.
MLA Handbook 8th edition by 
Publication Manual of the American Psychological Association (7th edition) by 
The Chicago Manual of Style, 17th Edition by 
AMA Manual of Style by
For decades indispensable, the AMA Manual of Style continues to provide editorial support to the medical and scientific publishing community. The 10th edition of the AMA Manual of Style brings this definitive manual into the 21st century with a broadened international perspective. In doing so, the 10th edition has expanded its electronic guidelines, with the understanding that authors now routinely submit articles through online systems and often cite Web-only content. Ethical and legal issues receive increased attention, with detailed guidelines on authorship, conflicts of interest, scientific misconduct, intellectual property, and the protection of individuals' rights in scientific research and publication. The new edition examines research ethics and editorial independence and features new material on indexing and searching as well as medical nomenclature. More than a style manual, this 10th edition offers invaluable guidance on how to navigate the dilemmas that authors and researchers and their institutions, medical editors and publishers, and members of the news media who cover scientific research confront in a society that has thrust these issues center stage.
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