It's important to cite sources that you used in your research. You cite:
Citation styles
There are many different ways of citing resources from your research. The citation style sometimes depends on the academic discipline involved.
PHYSICS
American Institute of Physics (AIP) Style
"AIP Style refers to the citation format established by the American Institute of Physics. AIP is the format commonly used in the field of physics. AIP is a numbered style with references numbered in the order of appearance in the article and listed in that order at the end of the article" -- From VirginiaTech University Libraries
"Developed by the American Chemical Society, this style may be used for research papers in the field of chemistry.
Each citation consists of two parts: the in-text citation, which provides brief identifying information within the text, and the reference list, a list of sources that provides full bibliographic information. Journal titles longer than one word are abbreviated according to the conventions set up by CASSI (Chemical Abstracts Service Source Index)." -- From VirginiaTech University Libraries
"AIP Style refers to the citation format established by the American Institute of Physics. AIP is the format commonly used in the field of physics. AIP is a numbered style with references numbered in the order of appearance in the article and listed in that order at the end of the article" -- From VirginiaTech University Libraries
CHEMISTRY
Other citation style guides:
CSE - Council of Science Editors for biology and other sciences
CSE - (from Dakota State University Library)
AMA - (American Medical Association) – (Health Sciences Library, New York Medical College)
APA - (from the Purdue Online Writing Lab)
MLA - (from the Purdue Online Writing Lab)
Brief Guide to citing Government Documents - (University of Memphis)