Citazione Stile APA (7a Edizione)

Howell, W. G. (2002). The Education gap: Vouchers and urban schools. The Brookings Institution.

Citazione stile Chigago Style (17a edizione)

Howell, William G. The Education Gap: Vouchers and Urban Schools. Washington, D. C: The Brookings Institution, 2002.

Citatione MLA (9a ed.)

Howell, William G. The Education Gap: Vouchers and Urban Schools. The Brookings Institution, 2002.