Gladwin, T. N. (1975). The role of ecological considerations in the multinational corporate project planning process: A comparative study of North American- and Western European-based petroleum chemicals and metal firms. University Microfilms International.

Gladwin, Thomas Neil. The Role of Ecological Considerations in the Multinational Corporate Project Planning Process: A Comparative Study of North American- and Western European-based Petroleum Chemicals and Metal Firms. Ann Arbor: University Microfilms International, 1975.

Gladwin, Thomas Neil. The Role of Ecological Considerations in the Multinational Corporate Project Planning Process: A Comparative Study of North American- and Western European-based Petroleum Chemicals and Metal Firms. University Microfilms International, 1975.