Template:Punnett, 1903
- Punnett, R.C. 1903. The Enteropneusta. In Gardiner, J.S., The Fauna and Geography of the Maldive and Laccadive Archipelagoes: Being the Account of the Work carried on and of the Collections made by an Expedition during the years 1899 and 1900. 2(2): 631–680, pls. XXXVII–XLVI. BHL