Gaya APA

Heymann, J., Barrera, M. (2010). PROFIT AT THE BOTTOM OF THE LADDER: creating value by investing on your workforce . Massachusetts: Harvard Business School Press.

Gaya MLA

Heymann, Jody., Barrera, Magda. "PROFIT AT THE BOTTOM OF THE LADDER: creating value by investing on your workforce". Massachusetts: Harvard Business School Press, 2010. Text.