United States. Dept. of Agriculture.. Principles of nutrition and nutritive value of food.. Washington, D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc6413/. Accessed May 23, 2013.
United States. Dept. of Agriculture.. Principles of nutrition and nutritive value of food.. Washington, D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc6413/. Accessed May 23, 2013.