Reference
Christian Schmid-Egger (2018): Buchbesprechung: Die Wildbienen Deutschlands Paul Westrich (2018) und Jan Smit (2018): Identification key to the European species of the bee genus Nomada Scopoli, 1770 (Hymenoptera, Apidae), including 23 new species – Ampulex - Zeitschrift für aculeate Hymenopteren – 10: 57 - 58.