Cita APA (7a ed.)

De Bono, E. (1990). Six thinking hats (Repr. of the first print by Viking of 1985.). Penguin books.

Cita Chicago Style (17a ed.)

De Bono, Edward. Six Thinking Hats. Repr. of the first print by Viking of 1985. London: Penguin books, 1990.

Cita MLA (9a ed.)

De Bono, Edward. Six Thinking Hats. Repr. of the first print by Viking of 1985. Penguin books, 1990.