Stellingwerf, D. A. (1969). The need for forest inventories. Waltman.
Lua i Stíl Chicago (17ú heag.)Stellingwerf, D. A. The Need for Forest Inventories. Delft,: Waltman, 1969.
Lua MLA (8ú heag.)Stellingwerf, D. A. The Need for Forest Inventories. Waltman, 1969.
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