Clawson, J. G. (2009). Level three leadership: Getting below the surface (4th ed.). Pearson/Prentice Hall.
Chicago-viite (17. p.)Clawson, James G. Level Three Leadership: Getting Below the Surface. 4th ed. Upper Saddle River, N.J: Pearson/Prentice Hall, 2009.
MLA-viite (9. p.)Clawson, James G. Level Three Leadership: Getting Below the Surface. 4th ed. Pearson/Prentice Hall, 2009.
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