Babbage, K. J. (2010). The extreme principle: What matters most, what works best. Rowman & Littlefield Education.
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Chicago-čujuhus (17. p.)
Babbage, Keen J. The Extreme Principle: What Matters Most, What Works Best. Lanham: Rowman & Littlefield Education, 2010.
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MLA-čujuhus (9. p.)
Babbage, Keen J. The Extreme Principle: What Matters Most, What Works Best. Rowman & Littlefield Education, 2010.
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