The water beetles of Cheshire /
Guest, Jonathan,author.
Harmer, Andy,author.
Tanyptera Trust.
Chester Zoo (Chester, England)
Cheshire Active Naturalists.
World Museum Liverpool.
Lancashire & Cheshire Entomological Society.
"Zoological Gardens Chester".
"C.A.N, Cheshire Active Naturalists".
"World Museum, National Museums Liverpool".
"Lancashire & Cheshire Entomological Society".