Discover@Bolton | University of Bolton (no date). Available at: http://www.bolton.ac.uk/library/Electronic-Resources/Discover-At-Bolton.aspx.
LEAP Online (no date). Available at: http://www.bolton.ac.uk/leaponline/Home.aspx.
Luther, F. and Nelson-Moon, Z. (2013a) Orthodontic Retainers and Removable Appliances: Principles of Design and Use. Chichester: Wiley-Blackwell.
Luther, F. and Nelson-Moon, Z. (2013b) Orthodontic retainers and removable appliances: principles of design and use. Chichester: Wiley-Blackwell. Available at: https://ebookcentral.proquest.com/lib/bolton/detail.action?docID=1039664.
Nakajima, E. (2010) Manual of wire bending techniques. Chicago: Quintessence Pub., Co.
Subject Guide: Dental Technology (no date). Available at: http://libguides.bolton.ac.uk/dentaltechnology.