The purpose of citation is to make sure that you give credit to others for their ideas, and to allow your readers to explore those ideas further.
Every citation style will share some basic features:
- journal articles are identified by author(s), article title, journal title, date of publication, volume and issue, and page numbers
- books are identified by author(s), publication date, publisher and place of publications, and possibly page and chapter numbers.
The differences among styles are how each of these information pieces is formatted, and the sequence in which they are arranged.
Engineering publications tend to have specific styles for different sub-disciplines.