Low, M. E. Y., and P. K. L. Ng. “On the Identity of Collingwood’s Pill-Making Crab, Sphaerapoeia collingwoodii Collingwood, 1868 (Crustacea: Decapoda: Brachyura: Dotillidae)”. Zootaxa, vol. 2761, no. 1, Feb. 2011, pp. 64–68, doi:10.11646/zootaxa.2761.1.5.