Ulrich, D., Smallwood, W. N., & Sweetman, K. (2008). The Leadership Code: Five Rules to Lead by. Harvard Business Review Press.
Lua i Stíl Chicago (17ú heag.)Ulrich, David, W. Norm Smallwood, agus Kate Sweetman. The Leadership Code: Five Rules to Lead by. Boston, Massachesutts: Harvard Business Review Press, 2008.
Lua MLA (9ú heag.)Ulrich, David, et al. The Leadership Code: Five Rules to Lead by. Harvard Business Review Press, 2008.
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