List of the specimens of hemipterous insects in the collection of the British Museum.
London :Printed by order of the Trustees,1851-1852.
University of California Libraries (archive.org)
Public domain. The BHL considers that this work is no longer under copyright protection.
Evidence reported by ian frederick-rothwell for item listofspecofhemi00britrich on February 28, 2007: no visible notice of copyright; stated date is 1852.