| Ref. | Description | Named Used | Page |
|---|---|---|---|
| 821 | Springsteen, F.J. and F.M. Leobrera 1986 Shells of the Philippines. | Engina concinna | 170 |
| 833 | Ruppert, E.E., R.S. Fox and R.D. Barnes 2004 Invertebrate Zoology. A functional evolutionary approach. 7th Ed. | Engina concinna | |
| 83677 | Poppe, G.T. 2008 Philippine Marine Mollusks Vol. 2, Gastropoda Part 2. | Engina concinna | |
| 126039 | Paulay, G. 2022 Reproduction of Neogastropoda. | Engina concinna |