Biochemistry. 5th ed.
Berg, Jeremy M.; Tymoczko, John L.; and Stryer, Lubert.
New York: W. H. Freeman and Co.; 2002.

The Cell - A Molecualar Approach. 2nd ed.
Cooper, Geoffrey M.
Sounderland (MA): Sinauer Associates, Inc.; c2000.

Modern Genetic Analysis
Griffiths, Anthony J.F.; Gelbart, William M.; Miller, Jeffrey H.; Lewontin, Richard C.
New York: W. H. Freeman & Co.; c1999.

Molecular Biology of the Cell. 4th ed.
Alberts, Bruce; Johnson, Alexander; Lewis, Julian; Raff, Martin; Roberts, Keith; Walter, Peter
New York: Garland Publishing; 2002.
Chapter 11
"Membrane Transport of Small Molecules and the Electrical Properties of Membranes"

Molecular Cell Biology. 4th ed.
Lodish, Harvey; Berk, Arnold; Zipursky, S. Lawrence; Matsudaira, Paul; Baltimore, David; Darnell, James E.
New York: W. H. Freeman & Co.; c1999.