Davies, L. M. (1932). The Genera Dictyoconoides Nuttall, Lockhartia nov., and Rotalia Lamarck: Their Type Species, Generic Differences, and Fundamental Distinction from the Dictyoconus Group of Forms. Transactions of the Royal Society of Edinburgh. 57(02): 397-428.
The Genera Dictyoconoides Nuttall, Lockhartia nov., and Rotalia Lamarck: Their Type Species, Generic Differences, and Fundamental Distinction from the Dictyoconus Group of Forms