I am writing my essay where I analyze how different text search algorithms work and compare their efficiency in specific situations.
I did not actually take even a sentence from where I have read about the algorithms, everything is written by myself, how I understood it, but of course I did not invent those algorithms, and I want (and I think this is a compulsory) to actually refer to those sources, but how do I do it? Should I simply create a footnote even though my essay does not contain any sentence from that source? My essay is going to be passed to some plagiarism checker, therefore, I do not want any problems with "fake footnotes just to make my essay look stronger" or something like that. We use ISO 690 citing style.