Hall, J. A. (1957). Timber Resources. United States Department of Agriculture.
Cita Chicago (17th ed.)Hall, J. A. Timber Resources. Madison: United States Department of Agriculture, 1957.
Cita MLA (9th ed.)Hall, J. A. Timber Resources. United States Department of Agriculture, 1957.
Atenció: Aquestes cites poden no estar 100% correctes.