| Ref. | Description | Named Used | Page |
|---|---|---|---|
| 833 | Ruppert, E.E., R.S. Fox and R.D. Barnes 2004 Invertebrate Zoology. A functional evolutionary approach. 7th Ed. | Zafra regulus | |
| 3116 | Smith, B.D. 2003 Prosobranch gastropods of Guam. | Zafra regulus | 262 |
| 126039 | Paulay, G. 2022 Reproduction of Neogastropoda. | Zafra regulus |