Blyth, J. E., & Weatherspoon, A. K. :. S. (1992). Michigan timber industry an assessment of timber product output and use. U.S. Department of agriculture.
Chicago (17e ed.) BronvermeldingBlyth, James E., en Anthony K : Smith Weatherspoon. Michigan Timber Industry an Assessment of Timber Product Output and Use. Minnestoa: U.S. Department of agriculture, 1992.
MLA (9e ed.) BronvermeldingBlyth, James E., en Anthony K : Smith Weatherspoon. Michigan Timber Industry an Assessment of Timber Product Output and Use. U.S. Department of agriculture, 1992.
Let op: Deze citaties zijn niet altijd 100% accuraat.