Osmia (Helicosmia) signata Erichson, 1835
- Baldock, D., Livory, A, Owens, N. 2019. Lists of the wasps and bees of the Balearic Islands, Spain (Hymenoptera: Chrysidoidea, Scolioidea, Vespoidea, Apoidea) with a Discussion of Aculeate Diversity and Endemism in Mediterranean and Atlantic Archipelagos. in prep.
- Baldock, D., Wood, T., Cross, I., Smit, J. 2018. The Bees of Portugal (Hymenoptera: Apoidea: Anthophila) – Entomofauna Suppl. S22: 1–164.
- Mavromoustakis, G.A. 1948. XL.—On the bees (Hymenoptera Apoidea) of Cyprus.—Part I, Annals and Magazine of Natural History, 12:1. pp.541-587.