Hartman, J. R., Pirone, T. P., & Sall, M. A. (2000). Pirone's tree maintenance (7th ed.). Oxford University Press.
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Chicago-čujuhus (17. p.)
Hartman, John Richard, T. P. Pirone, juo Mary Ann Sall. Pirone's Tree Maintenance. 7th ed. Oxford ; New York: Oxford University Press, 2000.
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MLA-čujuhus (9. p.)
Hartman, John Richard, et al. Pirone's Tree Maintenance. 7th ed. Oxford University Press, 2000.
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