Chao, Y. T. 1927. Productidae of China, Part 1: Producti. Palaeontologia Sinica, Series B, 5(2):1–244.
Sarycheva, T. G., and Sokolskaya, A. V. N., 1959. O klassifikatsin lozhnoporistykh brakhiopod. Akademiia Nauk SSSR Doklady, 125: 181-184. (In Russian)
Stehli, F. G. 1954. Lower Leonardian Brachiopoda of the Sierra Diablo. Bulletin of the American Museum of Natural History, 105(3):257–358.
Williams, A., Carlson, S. J., Brunton, C. H. C., Holmer, L. E., and Popov, L. E. 1996. A supra-ordinal classification of the Brachiopoda. Philosophical Transactions of the Royal Society of London B: Biological Sciences, 351:1171–1193.