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 Forum
Other useful websites
For links to other sites, see here.