Earll, R.C. & Farmery, S. & Mclachlan, H. & Stagg, A. & Strawbridge, J. & Strong, P. (1992)
A review of methods and results from a sighting scheme and field research on the basking shark in 1987-92. Basking shark Workshop, 15 Dec. 1992, UK, pp. 1–27 + app. 1–2