APA

Sarageldin I., Steer A. & Banco Mundial (Washington D. C. (1994). Valuing the environment. Washington, D. C: Banco Mundial.

Chicago

Sarageldin Ismail, Steer Andrew and Banco Mundial (Washington D C.). 1994. Valuing the environment. Washington, D. C: Banco Mundial.

Harvard

Sarageldin I., Steer A. and Banco Mundial (Washington D. C. (1994). Valuing the environment. Washington, D. C: Banco Mundial.

MLA

Sarageldin Ismail, Steer Andrew and Banco Mundial (Washington D C.). Valuing the environment. Washington, D. C: Banco Mundial. 1994.