^Berger A, Wachter H, eds. (1998). Hunnius Pharmazeutisches Wörterbuch (in German) (8 ed.). Walter de Gruyter Verlag. p. 343. ISBN3-11-015793-4.
^Reinicke C, Helbing M, Klingenfeld U, Lasaroff I, Wessel G (December 1984). "[Comparative studies on the bioavailability of various drug forms of phenylbutazone and clofezone (Perclusone)]". Die Pharmazie. 39 (12): 824–7. PMID6241720.