Barbour, I. G. (1976). Finite resources and the human future. Augsburg.
Cita Chicago (17th ed.)Barbour, Ian G. Finite Resources and the Human Future. Minnesota: Augsburg, 1976.
Cita MLA (9th ed.)Barbour, Ian G. Finite Resources and the Human Future. Augsburg, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.