This is an example of the IEEE citation style:
Van Doorn [1] discovered with a survey that most people dislike pistachio ice cream [2]. However, in more recent research, pistachio ended up in the top-3 of favorite flavours [3]. Bibliography [1] F. van Doorn, "Opinions on pistachio ice cream" in: The yearly ice cream magazine. Ice print, Harlem, 2015. [2] Wikipedia, Pistachio ice cream, 2001. [Online]. Available: http://en.wikipedia.com/Pistachio-ice-cream [Accessed Nov 25, 2018]. [3] A. Zuithoff, Ice cream favorites of 2017, 2017 [Online]. Available: http:// zuithoff.nl/ijslijst2016.html [Accessed Nov 25, 2018].
With this style, it is easier to find the references in the bibliography, as the sources are in the same order as they occur in the text.
This libguide of theUniversity of Pittsburgh provides a nice overview for citing different kinds of sources. Murdoch University has a very detailed guide per type of source.