Dr David R. Ragge
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] . The Songs of the Grasshoppers and Crickets of Western Europe. Colchester, Essex: Harley Books; 1998.
. The songs of the western European bush-crickets of the genus Platycleis in relation to their taxonomy (Orthoptera: Tettigoniidae). Bulletin of the British Museum (Natural History) Entomology. 1990;59(1):1-35.
. The songs and taxonomy of the grasshoppers of the Chorthippus biguttulus group in the Iberian Peninsula (Orthoptera: Acrididae). Journal of Natural History. 1988;22:897-929.
. The songs of the western European grasshoppers of the genus Stenobothrus in relation to their taxonomy (Orthoptera: Acrididae) . Bulletin of the British Museum (Natural History) Entomology. 1987;55(2). Available at: https://archive.org/details/bulletinofbritis552brit.
. Acoustic Laboratory. 1980.
. A putative hybrid in nature between Chorthippus brunneus and C. biguttulus (Orthoptera : Acrididae). Systematic Entomology. 1976;1(1):71-74.