1. G.A. Olah, Friedel Crafts and Related Reactions, Vol. III, 1964.
2. Ullamas Encyclopedia Vol. A1, p. 209.
3. Über Acylwanderungen an Phenolen
4. J. Kassner, H. Zimmer, in: F. Korte (Ed.), Methodicum Chimicum, Thieme, Vol. 5, Verlag, Stultgart, 1975, p. 432.
5. Friedel-Crafts acylation of toluene and p-xylene with carboxylic acids catalyzed by zeolites