In the Chicago documentation style (also sometimes called the Oxford system), a number indicating a footnote is used in the text. The source text is either reported in its entirety in the footnote, or in endnotes. The footnote numbering system may start over at the beginning of each chapter.
Here is an example of a citation in the running text:
“This is the only translation that exists, but it is censored, as some of its content, especially regarding the Swedish royal family, was deemed inappropriate.8“
Here is the corresponding footnote, at the bottom of the page:
8 Gunnar Wetterberg, “Handelsavtalet med England före sin tid”, Svenska Dagbladet (4/28/2004)
The work then also appears in the Bibliography, like this:
Wetterberg, Gunnar, “Handelsavtalet med England före sin tid”, Svenska Dagbladet (4/28/2004).