2 literature references for Hoplitis jheringii (Warncke, 1992):

Author:
Year: 2008
Title:
Source: manuscript, World Bee Checklist Project - update 2008-09
Author: Ungricht, Stefan, Andreas Müller, and Silvia Dorn
Year: 2008
Title: A taxonomic catalogue of the Palaearctic bees of the tribe Osmiini (Hymenoptera: Apoidea: Megachilidae)
Source: Zootaxa, issue 1865