British ascidians. Tunicata: Ascidiacea: keys and notes for the identification of the species
Millar, R.H. (1970). British ascidians. Tunicata: Ascidiacea: keys and notes for the identification of the species. Synopses of the British Fauna, N.S. 1. Academic Press: London. ISBN 12-496650-0. 92 pp.
Part of: Barnes, R.S.K.; Crothers, J.H. (Ed.) Synopses of the British Fauna. Linnean Society of London: London; New York. ISSN 0082-1101