Huggett، Andrew J. (2005). "The concept and utility of 'ecological thresholds' in biodiversity conservation". Elsevier BV. ج. 124 ع. 3: 301–310. DOI:10.1016/j.biocon.2005.01.037. ISSN:0006-3207.
Huggett، Andrew J. (2005). "The concept and utility of 'ecological thresholds' in biodiversity conservation". Elsevier BV. ج. 124 ع. 3: 301–310. DOI:10.1016/j.biocon.2005.01.037. ISSN:0006-3207.