When using footnotes, a number called a superscript is added at the end of the cited or summarised information. Normally the numbering runs consistently throughout the work. The superscript numbers correspond with notes either at the end of the page (footnote) or at the end of the text (end note). The footnotes and end notes state at least the author's name, the name of the publication and page numbers where the citation is from. The benefits of using footnotes is that the system does not break the structure of the text, and you can also include additional information that supports the main text in the footnotes. For example, you can use a footnote to justify an argument, point towards important differences between different resources, explain an abbreviation or expression in the text, etc. Footnotes are normally written in a smaller font than the main text and separated from the text by a horizontal line.
1 Mäkinen, P. & Lahtinen, S. Safety of the machinery. P. 90.