Παραπομπή APA

Dalen, G. M., & Tipton, C. R. (1974). Environmental accomplishments to date: A reason for hope : international symposium II, July 16-18, 1974. Ohio: Battelle Memorial Institute.

Παραπομπή Chicago Style

Dalen, George M., and Clyde R. Tipton. Environmental Accomplishments to Date: A Reason for Hope : International Symposium II, July 16-18, 1974. Ohio: Battelle Memorial Institute, 1974.

Παραπομπή MLA

Dalen, George M., and Clyde R. Tipton. Environmental Accomplishments to Date: A Reason for Hope : International Symposium II, July 16-18, 1974. Ohio: Battelle Memorial Institute, 1974.

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