Magretta, J. (2012). Understanding Michael Porter. Harvard Business School.
Chicago-čujuhus (17. p.)Magretta, Joan. Understanding Michael Porter. Boston: Harvard Business School, 2012.
MLA-čujuhus (9. p.)Magretta, Joan. Understanding Michael Porter. Harvard Business School, 2012.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.