Purdy, Elizabeth (2012). «Ecosystems». In: S. George Philander. Encyclopedia of Global Warming & Climate Change. 1 2nd ed. Thousand Oaks, CA: SAGE Reference. p. 485–487. ISBN978-1-4129-9261-9. doi:10.4135/9781452218564 – via Gale Virtual Reference Library
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Brenda Wilmoth Lerner and K. Lee Lerner, eds. (2009). «Ecosystems». Environmental Science: In context. Col: In Context Series. 1. Detroit: Gale. p. 242–246. ISBN978-1-4103-3754-2. OCLC277051356 !CS1 manut: Usa parâmetro editores (link)
Purdy, Elizabeth (2012). «Ecosystems». In: S. George Philander. Encyclopedia of Global Warming & Climate Change. 1 2nd ed. Thousand Oaks, CA: SAGE Reference. p. 485–487. ISBN978-1-4129-9261-9. doi:10.4135/9781452218564 – via Gale Virtual Reference Library
Brenda Wilmoth Lerner and K. Lee Lerner, eds. (2009). «Ecosystem Diversity». Environmental Science: In Context. Col: In Context Series. 1. Detroit: Gale. p. 239–241. ISBN978-1-4103-3754-2. OCLC277051356 !CS1 manut: Usa parâmetro editores (link)
Brenda Wilmoth Lerner and K. Lee Lerner, eds. (2009). «Ecosystems». Environmental Science: In context. Col: In Context Series. 1. Detroit: Gale. p. 242–246. ISBN978-1-4103-3754-2. OCLC277051356 !CS1 manut: Usa parâmetro editores (link)
Brenda Wilmoth Lerner and K. Lee Lerner, eds. (2009). «Ecosystem Diversity». Environmental Science: In Context. Col: In Context Series. 1. Detroit: Gale. p. 239–241. ISBN978-1-4103-3754-2. OCLC277051356 !CS1 manut: Usa parâmetro editores (link)