Use a Citation Generator
With a citation generator, you enter your source bibliographic information in order to produce a citation in your selected format that you can copy and paste into your paper. There are lots of free citation generators on the web to choose from, here is a selected list of citation generators:
Bibliographic management software (or citation management software)
HKUST Library subscribes to RefWorks. Here is a quick start guide.
There are others bibliographic management software availble on the web.