Engineers use several different citation styles to cite their research.
It is important to ask your professor which citation style they want you to use.
The University of Missouri has a guide to citing using the ASME (American Society of Mechanical Engineers) citation style.
Murdoch University provides information on how to cite using the IEEE (Institute of Electrical and Electronics Engineers) citation style.
APA is a popular citation style that you may need to use. Purdue has an excellent guide to using the APA citation style.