Cita APA (7th ed.)

Ludwig, H. (1991). Manual of environmental technology in developing countries. South Asian Publishers.

Cita Chicago (17th ed.)

Ludwig, Harvey. Manual of Environmental Technology in Developing Countries. New Delhi: South Asian Publishers, 1991.

Cita MLA (9th ed.)

Ludwig, Harvey. Manual of Environmental Technology in Developing Countries. South Asian Publishers, 1991.