REFERENCES
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- Lewis, E. A. (1925). Starlings as Distributors of ‘Gapes.’ Jl. of Hel., Vol. III, No. 2, May, pp. 81 and 82.
- Lewis, E. A. (1926)- Helminths of Wild Birds found in the Aberystwyth Area. Jl. of Hel., Vol. IV, No. 1, pp. 7–12.
- Lewis, E. A. (1926). Starlings as Distributors of ‘Gapes.’ Jl. of Hel., Vol. IV, No. 2, pp. 42–48.
- Lewis, E. A. (1928). Observations on the Morphology of Syngamus of some Wild and Domestic Birds. Jl. of Hel., Vol. VI, No. 2, pp. 99–112.
- Ortlepp, R. J. (1923). The Life History of Syngamus tracbealis. (Montagu) V. Siedold, the Gape-worm of Chickens. Jl. of Hel., Vol. I, No. 3, pp. 119–140.