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S2
Pagana, Kathleen D. & Pagana, Timothy J. (2001). Mosby’s Diagnostic and Laboratory Test Reference 5th Edition: Mosby, Inc., Saint Louis, MO.

S3
(1995-2004). Minerals and Electrolytes [19 paragraphs]. The Merck Manual of Medical Information – Second Home Edition [On-line information]. Available FTP: http://www.merck.com/mmhe/sec12/ch155/ch155a.html?qt=electrolytes&alt=sh

S4
Ben-Joseph, E., Reviewed (2004 July). Dehydration [21 paragraphs]. Familydoctor.org Information for Parents [On-line information]. Available FTP: http://www.kidshealth.org/PageManager.jsp?dn=familydoctor&lic=44&article_set=21646

S5
Webner, D., Updated (2003 August 18). CO2 [18 paragraphs]. MedlinePlus Medical Encyclopedia [On-line information]. Available FTP: http://www.nlm.nih.gov/medlineplus/ency/article/003469.htm

S6
A.D.A.M. editorial, Updated (2003 October 15). Electrolytes [3 paragraphs]. MedlinePlus Medical Encyclopedia [On-line information]. Available FTP: http://www.nlm.nih.gov/medlineplus/ency/article/002350.htm