Bennis Warren & Thomas Robert. (2003). Geeks & Geezers: How Era, Values and Defining Moments shape Leaders. Magna Publishing Co.,LTD.
Lua i Stíl Chicago (17ú heag.)Bennis Warren agus Thomas Robert. Geeks & Geezers: How Era, Values and Defining Moments Shape Leaders. Mumbai, india: Magna Publishing Co.,LTD, 2003.
Lua MLA (9ú heag.)Bennis Warren agus Thomas Robert. Geeks & Geezers: How Era, Values and Defining Moments Shape Leaders. Magna Publishing Co.,LTD, 2003.
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