1. American Heritage Science Dictionary (2005) 8th Edition Houghton Mifflin Company
2. Butz SD (2002) Science of Earth systems. Cengage Learning, Clifton Park, p 537. ISBN 978-0-7668-3391-3393
3. Cortés E (1999) Standardized diet compositions and trophic levels of sharks. ICES J Mar Sci 56(5):707–717
4. Dover CV (2000) The ecology of deep-sea hydrothermal vents. Princeton University Press, Princeton, p 117. ISBN 978-0-691-04929-8
5. Lisowski M, Miaoulis I, Cyr M, Jones LC, Padilla MJ, Wellnitz TR (2004) Prentice Hall science explorer: environmental science. Pearson Prentice Hall, Needlam. ISBN 978-0-13-115090-4