Παραπομπή APA

OMS. (1994). Operation and maintenance of urban water supply and sanitation systems: A guide for managers. Geneva: OMS.

Παραπομπή Chicago Style

OMS. Operation and Maintenance of Urban Water Supply and Sanitation Systems: A Guide for Managers. Geneva: OMS, 1994.

Παραπομπή MLA

OMS. Operation and Maintenance of Urban Water Supply and Sanitation Systems: A Guide for Managers. Geneva: OMS, 1994.

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