APA

I. Pennington J. A. T., .Food values of portions commonly used. New York: Harper y Row.

Chicago

I. Pennington Jean A T, .Food values of portions commonly used. New York: Harper y Row.

Harvard

I. Pennington J. A. T., .Food values of portions commonly used. New York: Harper y Row.

MLA

I. Pennington Jean A T, .New York: Harper y Row. .