Owen, E.; Smith, A.B. Kreide-Fossilien: Ein Bestimmungsatlas der Fossilien des Chalk

d'Abrera, B. Butterflies of the Neotropical Region 3: Brassolidae, Acraeidae, Nymphalidae (partim)

Maclise, Joseph Comparative Osteology: being Morphological Studies to demonstrate the Archetype Skeleton of Vertebrated Animals

Guide to British Bird Tracks and Signs (Identification Chart)

Wray, D.A. British Regional Geology: Pennines and Adjacent Areas