1. Bayer HE, editor. Metals hand book, vol. 7, 8th ed. Metals park (OH): American Society for Metals. p. 249.
2. Aluminium – properties and physical metallurgy,1984
3. Bayer HE, editor. Metals hand book, vol. 7, 8th ed. Metals Park (OH): American Society for Metals. p. 20.