2 literature references for Axinella mahonensis Ferrer-Hernandez, 1916:

Author: Van Soest, R.W.M.
Year: 2001
Title: Porifera, in: Costello, M.J. et al. (Ed.) (2001).
Source: European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50:
Author: Ferrer Hernández, F.
Year: 1916
Title: Fauna del Mediterráneo occidental. Esponjas españolas.
Source: Trabajos del Museo nacional de ciencias naturales (Zoológica) 27: 1-52.