1. On The Oil Lands;Ellis,1983
2. Early Days of Oil, A Pictorial History of the Beginnings of the Industry in Pennsylvania;Gibbens,1948
3. Essentials of the Risk Management Process, Volumes I & II;Head,1985
4. The First Pictorial History of the American Oil and Gas Industry 1859-1983;Knowles,1983
5. Corporate Risk Control;MacDonald,1990