Handbook of Degree-day Data for the United States.

American Petroleum Institute. Department of Technical Services.

Heating and Cooling Degree-day Characteristics in Arizona.

Christine R. Green

Handbook of Degree Day Data for the United States

Decennial Census of United States Climate. Heating Degree Day Normals.

United States Weather Bureau

Growing Degree Day Systems for Idaho

D. O. Everson

Great Lakes Degree-day and Winter Severity Index Update: 1897- 1983

Raymond A. Assel

One Degree Beyond

Janeanne Narrin