Now, your footnote should look like this (this is only an example; a footnote can appear at the bottom of a page or at the end of your paper, but before the bibliography section):
Georges Banu, « How I became an impresario », in Art Press, No 34, Paris: Impr. Le Scorpion, September 1987, p. 26.
For a bibliography reference, there are some differences though (the bibliography section must appear at the end of your paper, on the last page, where you mention all of your electronic and paper sources, books, reviews, etc…):
BANU, Georges. « How I became an impresario », in Art Press. No 34. Paris: Impr. Le Scorpion, September 1987. pp. 22-41.
[In an article’s bibliography reference, you must indicate the total number of pages; for example: pp. 22-41].