DE BONO EDWARD. (1987). LETTERS TO THINKERS: FURTHER THOUGHTS ON LATERAL THINKING. HARRAP LIMITED.
Citazione stile Chigago Style (17a edizione)DE BONO EDWARD. LETTERS TO THINKERS: FURTHER THOUGHTS ON LATERAL THINKING. LONDON: HARRAP LIMITED, 1987.
Citatione MLA (9a ed.)DE BONO EDWARD. LETTERS TO THINKERS: FURTHER THOUGHTS ON LATERAL THINKING. HARRAP LIMITED, 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.