The citation style you use depends on a variety of factors. Many disciplines tend to use one particular style over another (Chicago for art, for example). Your instructors may require you use a certain style, so ask about which manual to use before you start your research. If you are publishing one of your works, your editor may require that you use of a certain style.
If you aren't required to use a certain style, use one that you are comfortable with and that best fits your needs. Just follow the guidelines and be consistent.
Publication Manual of the American Psychological Association by 
Publication manual of the American Psychological Association by 