| Reference no. | Description | year | Name used | Page |
|---|---|---|---|---|
| 866 | Gosliner, T. 1987 Nudibranchs of Southern Arfrica: A guide to opistobranch molluscs of Southern Africa. Sea Challengers and Jeff Hamann in association with the California Academy of Sciences. 136 pp. | 1987 | Halgerda formosa | 69 |
| 104419 | Coleman, N. 2001 1001 Nudibranchs catalogue of Indo-Pacific sea slugs. Neville Coleman's Underwater Geographic Pty Ltd, 144p. | 2001 | Halgerda formosa | 58 |
| 833 | Ruppert, E.E., R.S. Fox and R.D. Barnes 2004 Invertebrate Zoology. A functional evolutionary approach. 7th Ed. Brooks/Cole, Thomson Learning learning, Inc. 990 p. | 2004 | Halgerda formosa | --> |