From what I understand, Georges Banu went to a conference given by Jerzy Grotowski and, after hearing Grotowsky, decided to write an article regarding this particular conference, which he published in a 1987 ART PRESS review.
So, if that’s the proper context for your source, your reference note should appear as follows (this is only an example):
Georges Banu, « Title of the article between quote marks », in Art Press (the title of the review, Art Press, must appear in italicized letters), # 34 (here goes the review’s edition number, for instance #34 or No 34 if it is its 34th publication), Paris : Impr. Le Scorpion, September 1987, p. 26 (after « p. », indicate the page number of your article’s quote or source of information; for example, p. 26, or pp. 26-27 if the source of your information appears on more than a single page). P.S.: after a quick research, it seems that this review’s editor is Impr. Le Scorpion.
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].