The primary reasons for citing sources in a research paper are to give credit to the authors whose work you have drawn upon and to allow readers to track down your sources, should they wish to explore further. There are many style guides for formatting citations and creating bibliographies. The AIP (the American Institute of Physics) Style Guide is frequently used in physics, but your professor may specify another format.
References should be set as a double-spaced list at the end of the text. The names, including initials, of all authors in each reference should be given (in the text, the use of “et al.” is permissible).
All references to books and journal articles, listed at the end of the paper, are to appear in only one of these three formats:
A recent measurement2 of rv
A recent measurement of rv 2