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Tilson, R. (1999) Sumatran Tiger Project Report No. 17 & 18: July - December 1999 grant number 1998-0093-059. Indonesian Sumatran Tiger Steering Committee, Jakarta. pdfArhivirano 2011-07-16 na Wayback Machine.
Breining, G. (2002) What's Our Zoo Got to Do With It? Minnesota Conservation Volunteer. pdfArhivirano 2008-07-24 na Wayback Machine.