| Reference no. | Description | Year | Name Used | Page |
|---|---|---|---|---|
| 94599 | Schindler, I. and W. Staeck, 2013. Description of Apistogramma helkeri sp. n., a new geophagine dwarf cichlid (Teleostei: Cichlidae) from the lower río Cuao (Orinoco drainage) in Venezuela. Vert. Zool. 63(3):301-306. | 2013 | Apistogramma helkeri | 302;fig.1-4;tab.1 |
| 128868 | Beolens, B., M. Grayson and M. Watkins, 2023. Eponym dictionary of Fishes. Dunbeath, Caithness (Scotland, UK): Whittles Publishing Limited, 1300 p. | 2023 | Apistogramma helkeri | 568 |