(1933). A forest of the coal age / by B.E. Dahlgren ..
Cita Chicago (17th ed.)A Forest of the Coal Age / by B.E. Dahlgren .. 1933.
Cita MLA (9th ed.)A Forest of the Coal Age / by B.E. Dahlgren .. 1933.
Atenció: Aquestes cites poden no estar 100% correctes.