Butterflies and Moths of Yorkshire: Distribution and Conservation. 1989. Sutton, S.L., & Beaumont, H.E..
Butterflies and Moths of Yorkshire: A Millennium Review. 2002. Ed. by Beaumont, H.E..
Porritt's Lists. 2011. Frost, H.M., H.E. Beaumont, H.E., Crawford, T.J., Fryer, G. & Yeates, C.S.W..
Argus. A Newsletter and annual Report published jointly by YNU and BCY.
Yorkshire Naturalists' Union
Butterfly Conservation, Yorkshire Branch
Yorkshire Moths Facebook page
Other useful websites
For links to other sites, see here.