Protosmia (Nanosmia) minutula (Pérez , 1896)
- Amiet, F., Herrmann, M., Müller, A. and Neumeyer, R. 2004. Apidae 4. Anthidium, Chelostoma, Coelioxys, Dioxys, Heriades, Lithurgus, Megachile, Osmia, Stelis. Fauna Helvetica, CSCF, SEG.
- 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.