Park, C. F. (1975). Earthbound: Minerals, energy, and man's future. Freeman.
Cita Chicago (17th ed.)Park, Charles F. Earthbound: Minerals, Energy, and Man's Future. San Francisco: Freeman, 1975.
Cita MLA (9th ed.)Park, Charles F. Earthbound: Minerals, Energy, and Man's Future. Freeman, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.