Sperry, L. (2004). Effective Leadership: Strategies for Maximizing Executive Productivity and Health. Brunner-Routledge.
Čikaški stil citiranja (17. izdanje)Sperry, Len. Effective Leadership: Strategies for Maximizing Executive Productivity and Health. New York: Brunner-Routledge, 2004.
MLA način citiranja (9. izdanje)Sperry, Len. Effective Leadership: Strategies for Maximizing Executive Productivity and Health. Brunner-Routledge, 2004.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.