The larger moths and butterflies of Herefordshire & Worcestershire :
an atlas /
by Michael Harper and Tony Simpson.
APA Citation
Harper, M. (Michael W.)., Simpson, T. (Anthony N. B.)., British Butterfly Conservation Society. West Midlands Branch. (2001). The larger moths and butterflies of Herefordshire & Worcestershire: an atlas. [Malvern, England?]: West Midlands Branch of Butterfly Conservation.
MLA Citation
Harper, Michael (Michael W.), Tony (Anthony N. B.) Simpson, and British Butterfly Conservation Society. West Midlands Branch. The Larger Moths And Butterflies of Herefordshire & Worcestershire: an Atlas. [Malvern, England?]: West Midlands Branch of Butterfly Conservation, 2001.
Warning: These citations may not always be complete (especially for serials).