Center For Science And Environment. (2013). Excreta Matters. Center For Science And Environment.
Cita Chicago (17th ed.)Center For Science And Environment. Excreta Matters. Delhi: Center For Science And Environment, 2013.
Cita MLA (9th ed.)Center For Science And Environment. Excreta Matters. Center For Science And Environment, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.