Minto, Barbara
The Minto pyramid principle : logic in writing, thinking and problem solving
Minto International , 1996
 Buku Teks SO
Neimark, Edith D.
Adventures in thinking
Harcourt Brace Javanovich, 1987
 Buku Teks SO
Fogler, H. Scott
Strategies for creative problem solving
Prentice-Hall, 2008
 Multimedia
Fogler, H. Scott
Strategies for creative problem solving
Prentice-Hall, 2008
 Multimedia
Fogler, H. Scott
Strategies for creative problem solving
Prentice-Hall, 2014
 Buku Teks SO