Bloomer. 1927. Margaritifera margaritifera: notes on the variation of the British and Irish forms. Proceedings of the Malacological Society of London 17: 208-216. https://doi.org/10.1093/oxfordjournals.mollus.a063925.
Bloomer, 1927. Proc. Malac. Soc. London 17: 211.
(intro'd as intra-sp. of Mya margaritifera Linnaeus, 1758)