Hylaeus (Paraprosopis) clypearis (SCHENCK, 1853)
- Baldock, D., Wood, T., Cross, I., Smit, J. 2018. The Bees of Portugal (Hymenoptera: Apoidea: Anthophila) – Entomofauna Suppl. S22: 1–164.
- Balzan, M.V., Rasmont, P., Kuhlmann, M., Dathe, H., Pauly, A., Patiny, S., Terzo, M. and Michez, D. 2016. The bees (Hymenoptera: Apoidea) of the Maltese Islands. Zootaxa, 4162(2), pp.225-244.
- Tomozei, B. 2008. Checklist of Bees of the genera Colletes Latreille 1930 and Hylaeus Fabricius 1793 of Romania (Hymenoptera: Apiformes: Colletidae) Faunistic Entomology – Entomologie faunistique 2008 61 (3), 87-97.