Extension packages can be installed to format your document according to specific style guidelines, like IEEE, AMS, or ACS. In general, to implement a citation style, you must download a bibliography style file (.bst) and/or a style file (.sty) (or generate them from .dtx and .ins files).
Use LaTeX commands to apply the style and generate your bibliography. These vary depending on the extension package. Look for the README file for instructions on how to implement the style.
DOWNLOAD STYLE FILES: