Richards, A.J.; Stephenson, J.H.. Avionic Navigation Systems Specialist. Extension Course Institute, Air University, 1984, p. 169 (Avionic Navigation Systems Specialist).
«Bits From MRO Tools». mrotools.com. Arxivat de l'original el 2012-04-25. «The Frearson recess is designed so that any size bit will fit any size recess.»
"The Phillips screwdriver has about 30° flukes and a blunt end, while the Reed and Prince has 45° flukes and a sharper, pointed end." RECESSED www.tpub.comArxivat 2009-04-08 a Wayback Machine. October 2011
"The Phillips screwdriver has about 30° flukes and a blunt end, while the Reed and Prince has 45° flukes and a sharper, pointed end." RECESSED www.tpub.comArxivat 2009-04-08 a Wayback Machine. October 2011
«Bits From MRO Tools». mrotools.com. Arxivat de l'original el 2012-04-25. «The Frearson recess is designed so that any size bit will fit any size recess.»
