(1976). Proceedings of a Symposium on Coal Dilemma: How and Where to Use It: the Broadmoor Hotel, Colorado Springs, Colorado, January 31-February 2, 1977. Denver: The Engineers.
Παραπομπή Chicago StyleProceedings of a Symposium On Coal Dilemma: How and Where to Use It: The Broadmoor Hotel, Colorado Springs, Colorado, January 31-February 2, 1977. Denver: The Engineers, 1976.
Παραπομπή MLAProceedings of a Symposium On Coal Dilemma: How and Where to Use It: The Broadmoor Hotel, Colorado Springs, Colorado, January 31-February 2, 1977. Denver: The Engineers, 1976.
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