↑ Page, A.P. and Johnstone, I.L. (March 19, 2007) The cuticle, In: WormBook, ed. by J. M. Kramer & D. G. Moerman. The C. elegans Research Community, WormBook, doi/10.1895/wormbook.1.138.1,
↑ "insect physiology" The McGraw-Hill Encyclopedia of Science of Technology, Vol. 9, p. 233 2007
