Gaya APA

Heymann, J., Barerra, M. (c2010). Profit at the bottom of the ladder: creating value by investing in your workforce . mau: Harvard Business Press.

Gaya MLA

Heymann, Jody., Barerra, Magda.. "Profit at the bottom of the ladder: creating value by investing in your workforce". mau: Harvard Business Press, c2010. Buku.