Rujukan Penualan balak

  1. ↑ Johnston, Hank (1968). Thunder in the Mountains: The Life and Times of Madera Sugar Pine. Trans-Anglo Books. m/s. 11. ISBN 0-87046-017-X.
  2. ↑ Kauffman, Henry J.. American axes; a survey of their development and their makers,. Brattleboro, Vt.: S. Greene Press, 1972. 109. Print.
  3. ↑ Weintraub, Andres. Handbook of operations research in natural resources. New York: Springer Science+Business Media, 2007. 379. Print.
  4. ↑ Chapman, Herman Haupt, and Walter Huber Meyer. Forest Mensuration,. New York: McGraw-Hill, 1949. 13. Print.
  5. 1 2 Dunster, Julian A., and Katherine Jane Dunster. "BILLET", Dictionary of Natural Resource Management. Vancouver, BC: UBC, 1996. 36. Print.

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