Blyth, J. E., & Weatherspoon, A. K. :. S. (1992). Michigan timber industry an assessment of timber product output and use. U.S. Department of agriculture.
Citazione stile Chigago Style (17a edizione)Blyth, James E., e Anthony K : Smith Weatherspoon. Michigan Timber Industry an Assessment of Timber Product Output and Use. Minnestoa: U.S. Department of agriculture, 1992.
Citatione MLA (9a ed.)Blyth, James E., e Anthony K : Smith Weatherspoon. Michigan Timber Industry an Assessment of Timber Product Output and Use. U.S. Department of agriculture, 1992.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.