Spry, Constance Simple Flowers: 'A Millionaire for a Few Pence'

Sargerson, J. Swiss Butterflies Site Guide

Balduf, W.V, The Bionomics of Entomophagous Coleoptera

Dawkins, R. The Ancestor's Tale: A Pilgrimage to the Dawn of Life

Thomas, J. The Coleoptera of the Witherslack Area of Cumbria