Gaya APA

Mill, J, S., Laughlin, J, L. (2009). Principles Of Political Economy (September 27, 2009). New York: The Project Gutenberg.

Gaya MLA

Mill, John, Stuart., Laughlin, J., Laurence. "Principles Of Political Economy". September 27, 2009 New York: The Project Gutenberg, 2009. e-book.