The Chemical Engineering department does not have a single preferred style, so you might want to check with your lecturer/supervisor. Some common styles include:
xkcd.com. (n.d.). Wikipedian protester. Retrieved from http://xkcd.com/285/
It pays to keep a good record of what you read while doing research. There are now a number of tools available to help do this.
EndNote is software for Windows or for MacOS that
Other similar software includes