Obeng, L. A. (1987). The co-composting of domestic solid and human wastes. World Bank.
Cita Chicago (17th ed.)Obeng, Letitia A. The Co-composting of Domestic Solid and Human Wastes. Washington: World Bank, 1987.
Cita MLA (9th ed.)Obeng, Letitia A. The Co-composting of Domestic Solid and Human Wastes. World Bank, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.