1. American National Standard Minimum Design Loads for Buildings and Other Structures ANSI A58.1‐1982 American National Standards Institute New York N.Y. 1982.
2. Canadian Structural Design Manual Supplement No. 4 to the National Building Code of Canada National Research Council of Canada Ottawa 1970.
3. Chin I. Gouwens A. and Hanson J. “Review of Roof Failures in the Chicago Area Under Heavy Snow Loads ” preprint 80‐145 American Society of Civil Engineers New York N.Y. 1980.
4. Finney E. A. “Snow Drift Control by Highway Design ” Michigan State College Engineering Stn. Bulletin 86 1939.