Johnson, S. E., & Richaenhaller, J. (1978). Patents relating to mechanization of timber harvesting (4th ed.). Canadian Forestry Service.
Chicago-viite (17. p.)Johnson, S. E., ja J. Richaenhaller. Patents Relating to Mechanization of Timber Harvesting. 4th ed. Ottawa: Canadian Forestry Service, 1978.
MLA-viite (9. p.)Johnson, S. E., ja J. Richaenhaller. Patents Relating to Mechanization of Timber Harvesting. 4th ed. Canadian Forestry Service, 1978.
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