Derry, Gregory N.
What science is and how it works
Princeton University Press, 1999
 Buku Teks SO
Prudential supervision : what works and what doesn't
edited by Frederic S. Mishkin
University of Chicago Press, 2001
 Buku Teks SO
Assessing aid : what works, what doesn't, and why
Oxford University Press, 1998
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Phillips, Jeffrey
Relentless innovation : what works, what doesn't-and what that means for your business
McGraw-Hill, 2012
 Buku Teks SO
Aalseth, Patricia
Medical coding: what it is and how it works
Jones & Bartlett Learning, 2015
 Buku Teks SO