Assessing aid : what works, what doesn't, and why
Oxford University Press, 1998
Buku Teks
Phillips, Jeffrey
Relentless innovation : what works, what doesn't-and what that means for your business
McGraw-Hill, 2012
Buku Teks
Sutherland, Max
Advertising and the mind of the consumer: what works, what doesn't, and why
Allen and Unwin, 2000
Buku Teks
Gosh, Barbara
Public enterprise in Kenya : what works, what doesn't, and why / Barbara Grosh
Lynne Rienner, 1991
Buku Teks
Rosenfeld, Isadore
Dr. Rosenfeld's guide to alternative medicine : what works, what doesn't- and what's right for you
Random House, 1996
Buku Referensi