References

Arnett, R. 1985. American insects: a handbook of the insects of America North of Mexico. Van     Nostrand Reinold Company Limited.

Bartlett, T. 2011. Species Cordulegaster maculata - Twin-spotted Spiketail. BugGuide. <URL: http://bugguide.net/node/view/123649#336026>. Accessed 4 April 2012.

Berger, C. 2004. Dragonflies. STACKPOLE BOOKS, Mechanicsburg, Pennsylvania, USA.

Corbet, P. 1962. A biology of dragonflies. Quadrangle Book, Incorporated, Chicago, Illinois.

Dunhle, S. 2010. Dragonflies through binoculars: a field guide to dragonflies of North America. Oxford University Press, New York, New York.

Dunn, G. 1996. Insects of the Great Lakes region. University of Michigan Press.                                                 

Needham, J. and J. Westfall. 1955. Dragonflies of North America. University of California Press Berkeley and Los Angeles. 

2011. Dragonflies. Animal Corner. <URL: http://www.animalcorner.co.uk/insects/dragonfly/dragonfly.html>. Accessed 4 April 2012.