Gaya APA

Ulrich, D., Smallwood, N. (2013). Leadership Sustainability, Seven Disciplines to Achieve The Changes Great Leaders Know They Must Make . Singapore: Mc Graw Hill.

Gaya MLA

Ulrich, Dave., Smallwood, Norm. "Leadership Sustainability, Seven Disciplines to Achieve The Changes Great Leaders Know They Must Make". Singapore: Mc Graw Hill, 2013. Text.