Most science papers are referenced using a numbered style (eg Vancouver).
Remember to check with your supervisor about what the style should be for any piece of work you submit as part of your course.
If you are publishing your paper it is important to check the "instructions for authors" to ensure your submission meets the criteria of the journal in question. Using a reference management tool, such as Endnote or Mendeley, means you can switch between referencing styles easily if required to change.
Do you know what plagiarism is?
Do you know what plagiarism looks like?
You can use this guide to find out more about avoiding plagiarism.