^Ragatz, Lowell., ed. The Fournier Album of Philatelic Forgeries: A Photographic Composite for Reference Purposes. Worthington, Ohio: Janet van den Berg, 1970, introduction.
^Tyler, Varro E. Philatelic Forgers: Their Lives and Works. London: Robson Lowe Ltd., 1976, pp. 14-15. (ردمك 0-85397-052-1)
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