Παραπομπή APA

Nephew, E. A., & Spore, R. L. (1976). Costs of coal surface mining and reclamation in Appalachia. United States: National Technical Information Service.

Παραπομπή Chicago Style

Nephew, E. A., and R. L. Spore. Costs of Coal Surface Mining and Reclamation in Appalachia. United States: National Technical Information Service, 1976.

Παραπομπή MLA

Nephew, E. A., and R. L. Spore. Costs of Coal Surface Mining and Reclamation in Appalachia. United States: National Technical Information Service, 1976.

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