APA-Zitierstil (7. Ausg.)

Vacca, J. R. (2005). The world's 20 greatest unsolved problems. Prentice Hall PTR.

Chicago-Zitierstil (17. Ausg.)

Vacca, John R. The World's 20 Greatest Unsolved Problems. Upper Saddle River, NJ: Prentice Hall PTR, 2005.

MLA-Zitierstil (9. Ausg.)

Vacca, John R. The World's 20 Greatest Unsolved Problems. Prentice Hall PTR, 2005.