Peterson, J. A., & Tuxill, J. D. (1998). Losing strands in the web of life: Vertebrate declines and the conservation of biological diversity. Worldwatch Institute.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPeterson, Jane A., এবং John D. Tuxill. Losing Strands in the Web of Life: Vertebrate Declines and the Conservation of Biological Diversity. Washington, DC: Worldwatch Institute, 1998.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিPeterson, Jane A., এবং John D. Tuxill. Losing Strands in the Web of Life: Vertebrate Declines and the Conservation of Biological Diversity. Worldwatch Institute, 1998.