Looker, H. C., Krakoff, J., Andre, V., Kobus, K., Nelson, R. G., Knowler, W. C., & Hanson, R. L. (2010). Secular Trends in Treatment and Control of Type 2 Diabetes in an American Indian Population: A 30-Year Longitudinal Study. American Diabetes Association.

Looker, Helen C., Jonathan Krakoff, Vickie Andre, Kathy Kobus, Robert G. Nelson, William C. Knowler, và Robert L. Hanson. Secular Trends in Treatment and Control of Type 2 Diabetes in an American Indian Population: A 30-Year Longitudinal Study. American Diabetes Association, 2010.

Looker, Helen C., et al. Secular Trends in Treatment and Control of Type 2 Diabetes in an American Indian Population: A 30-Year Longitudinal Study. American Diabetes Association, 2010.