Madsen, J. & Vessem, J. V. (Ed.) (1994). Lesser White-fronted Goose (Anser erythropus). In J. V. Vessem (Ed.), Actions to Prevent Avoidable Mortality for Threatened Waterbirds in the European Community: Report Prepared for the Commission of the European Communities (pp. 131-136). International Waterfowl and Wetlands Research Bureau.
Madsen, J., Tucker, G. M. (Ed.), Heath, M. F. (Ed.), Tomialojc, L. (Ed.) & Grimmett, R. F. A. (Ed.) (1994). Brent Goose (Branta bernicla). In Birdlife Conservation Series (pp. 114-115). Birdlife International.