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International Tropical Timber Organization, ITTO (ed.) (2016). Criteria and indicators for the sustainable management of tropical forests ITTO Policy Development Series: Vol. 21. Yokohama: ITTO
Blaser, Jürgen; Ismail, Shaharuddin Mohamad International Tropical Timber Organization, ITTO (ed.) (2015). Voluntary guidelines for the sustainable management of natural tropical forests (revised edition) ITTO Policy Development Series: Vol. 20. Yokohama: ITTO