| 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. | Palaeocomatella difficilis | |
| 3477 | MarineSpecies.org 2050 MarineSpecies.org. | Palaeocomatella difficilis | |
| 68823 | Castro, P. and M.E. Huber 2005 Marine biology. | Palaeocomatella difficilis | |
| 100368 | Messing, C.G. 2007 The Crinoid Fauna (Echinodermata: Crinoidea) of Palau. | Palaeocomatella difficilis | |
| 102268 | OBIS 2015 Palaeocomatella difficilis (Carpenter, 1888). | Palaeocomatella difficilis |