1. Halanych, K.M., Bacheller, J.D., Aguinaldo, A.M., et al., Evidence from 18S ribosomal DNA that the lophophorates are protostome animals, Science, 1995, vol. 267, pp. 1641–1643.
2. Kovalevsky, A.O., Observations sur le developpement des brachiopods (Analysis by Oehlert and Deniker), Arch. Zool. Exp. Gen., 1883, vol. 2, pp. 57–76.
3. Conklin, E.G., The embryology of a brachiopod, Terebratulina septentrionalis Couthouy, Proc. Am. Philos. Soc., 1902, vol. 41, pp. 41–76.
4. Percival, E., A contribution to the life-history of the brachiopod Terebratella inconspicua Sowerby, Trans. R. Soc. N. Z., 1944, vol. 74, pp. 1–23.
5. Percival, E., A contribution to the life-history of the brachiopod Tegulorhynchia nigricans,
Q. J. Microsc. Sci., 1960, vol. 101, pp. 439–457.