References

Reference Page

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De Bono, E. (1990). //Six thinking hats.// London: Penguin.

De Bono, E. (1992). //Six Thinking Hats for Schools.// New York: Hawker Brownlow Education.

De Bono, E. (1992). //Six thinking hats for schools : teacher resource books 1,2,3,4.// Hawker Browlow Education.

De Bono, E. (1994). //De Bono's Thinking Course.// London: BBC Books.