Donovan, E. (1808). Conchology, plate VI.
In: Rees, A. (Ed.), 1802–1820, The Cyclopædia; or, Universal Dictionary of Arts, Sciences, and Literature. Longman, Hurst, Rees, Orme and Brown, London. Plates Vol. V. Natural History [stated date 1 November1808 at the bottom of the plate].