10. References
- Chadwick , H. C. 1914 . Echinoderm larvae . Liverpool Marine Biological Committee Memoirs , 22 : 20 – 22 .
- Mortensen , Th. 1921 . Studies of the development of larval forms of Echinoderms. Copenhagen
- Mortensen , Th. 1927 . Handbook of the Echinoderms of the British Isles. 264 – 267 . Oxford University Press .
- Mortensen , Th. 1931 . Contribution to the study of the development and larval forms of the Echinoderms. D. Kgl. Danske. Vidensk. Selsk. Skrifter, Naturvidensk. og Mathem. Afd., 9. Raekke . IV , 1 : 25 – 26 .