Potassium Metabolism - The Merck Manual: A discussion on potassium and internal and external potassium balance, disorder of potassium metabolism, signs, symptoms, diagnosis, prophylaxis and treatment. - http://www.merck.com/pubs/mmanual/section2/chapter12/12c.htm
Merck Manual: Potassium - Explains the importance of this mineral in the functioning of the human body. Includes information about hypokalemia (too low) and hyperkalemia (too high). - http://www.merck.com/mmhe/sec12/ch155/ch155i.html