Style manual of the American Chemical Society (ACS). This is the definitive reference on citation and formatting for all chemists writing for publication.
Style manual of the American Medical Association (AMA). This is the most comprehensive style guide in the medical and public health fields, and is closely related to the Uniform Requirements of the ICMJE (Vancouver style).
The National Library of Medicine (NLM) citation style provides guidance for citing complicated biomedical sources. It follows recommendations and standards set by the International Committee of Medical Journal Editors (ICMJE) and the National Information Standards Organization (NISO).
Style Manual of the Council of Science Editors is the most recognized and authoritative reference for authors, editors, publishers, students, and translators in all areas of science and related fields. NOTE: CSE style allows for 3 citing systems: Citation-Sequence, Name-Year, and Citation-Name. Ask your instructor which system you should use.