Citazione APA

Hammond, A. L., Metz, W. D., & Maugh, T. H. (1973). Energy and the future. American Association for the Advancement of Science.

Stile di citazione Chicago

Hammond, Allen L., William D. Metz, e Thomas H. Maugh. Energy and the Future. Washington: American Association for the Advancement of Science, 1973.

Citazione MLA

Hammond, Allen L., et al. Energy and the Future. American Association for the Advancement of Science, 1973.