BioStor
 | The early literature on Mallophaga. Part II, 1763-1775 T Clay and G H E Hopkins (1951) Bull. Brit. Mus. (Nat. Hist.), London Ent. 2: 1-37 |
 | The early literature on Mallophaga (part III, 1776–1786) Theresa Clay and G H E Hopkins (1954) Bulletin of the British Museum (Natural History), Entomology 3(6): 223-266 |