References:

Baker, F.C.  1939.  Fieldbook of Illinois land snails.  Natural History Survey Division, Urbana, Illinois, USA.  19, 104.  

Burch, J.B.  1962.  How to know the eastern land snails: pictured keys for determining the land snails of the United States occurring east of the Rocky Mountain Divide.  WM.C Brown Company Publishers, Dubuque, Iowa, USA.  1-19, 59.  

Cordeiro, J.  2010.  <URL:  http://www.natureserve.org/explorer/servlet/NatureServe?searchSciOrCommonName=vertigo+morsei >.  Accessed 28 March 2011.

Definition of Vertigo.  1998.  <URL:  http://www.medterms.com/script/main/art.asp?articlekey=6129>.  Accessed 17 March 2011.

Endangered Resources Program Species Information: Six-whorl Vertigo (Vertigo morsei).  2009.  <URL:  http://dnr.wi.gov/ORG/LAND/ER/biodiversity/index.asp?mode=info&Grp=24&SpecCode=IMGAS20220>.  Accessed 17 March 2011.

Hickman, C.P., L.S. Roberts, S.L. Keen, A. Larson, D.J. Eisenhour.  2009.  Animal Diversity.  McGraw Hill, USA. 

Nekola, J. and Coles, B. 2010. Pupillid land snails of eastern North America. American Malacological Bulletin 28:1-29.

Perez, K.E. and R.L. Minton.  2008.  Practical applications for systematics and taxonomy in North American freshwater gastropod conservation.  Journal of the North American Benthological Society.  <URL:  http://www.uwlax.edu/biology/faculty/perez/Perez/
PerezLab/Research/Publications/Perez_Minton_JNABS_2008.pdf >.  Accessed 1 April 2011.   

Pilsbry, H.A.  1919.  Manual of Conchology.  Second Series: Pulmonata.  Conchological Department of Philadelphia, Academy of Natural Sciences of Philadelphia.  Vol. 25.  81-82.  

Pilsbry, H.A.  1948.  Land Mollusca of North America.  Wickersham Printing Company, Lancaster, Pennsylvania, USA.  Vol. 2.  Part 2.  943, 952, 868.

Vertigo morsei Sterki.  2009.  <URL: http://web4.msue.msu.edu/mnfi/abstracts/zoology/Vertigo_morsei.pdf >.  Accessed 17 March 2011.

 

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