Παραπομπή APA

(1994). Operation and maintenance of Urban water supply and sanitation systems: A guide for managers. World Health Organisation.

Παραπομπή Chicago Style

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

Παραπομπή MLA

Operation and Maintenance of Urban Water Supply and Sanitation Systems: A Guide for Managers. World Health Organisation, 1994.