1. Drumlins of south-eastern Wisconsin;Alden;US Geol. Surv. Bul.,1905
2. Glaciation in north central British Columbia;Armstrong;Am. J. Sci.,1948
3. Morphometry of landforms: drumlins;Barnett;Army Natick Labs Mass Earth Sci. Lab Tech. Rep.,1971
4. Glaciers and Glaciation;Benn,1998
5. A theory of drumlin formation by subglacial sediment deformation;Boulton,1987