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.
Selected books that may be of help in writing and citing
Writing for Science by 
Making Sense: A Student's Guide to Research and Writing by
The Making Sense series offers clear, concise guides to research and writing for students at all levels of undergraduate study. The volumes in the Making Sense series-covering courses in humanities, social sciences, life sciences, engineering, psychology, religious studies, and education-are intended for students in any undergraduate course with a research and writing component, but are especially appropriate for those at the first-year level. Revisions to the second edition of Making Sense in the Life Sciences include coverage of new developments in technology-based research and writing. It provides examples on how to read scientific articles, how to find the papers that students need for their essays, and how to move this information into bibliographies. This edition also provides examples of how to search across various databases to find the important papers in a field, as well as how to burrow deeply into scientific literature.
