Gaya APA

Heymann, J., Barrera, M. (2010). Profit at the bottom of the ladder : creating value by inversting in your workforce . Boston: Harvard Business Press.

Gaya MLA

Heymann, Jody., Barrera, Magda. "Profit at the bottom of the ladder : creating value by inversting in your workforce". Boston: Harvard Business Press, 2010. Text.