World Health Organization. (2011). Guide to ship sanitation. World Health Organization.
Cita Chicago (17th ed.)World Health Organization. Guide to Ship Sanitation. Geneva, Switzerland: World Health Organization, 2011.
Cita MLA (8th ed.)World Health Organization. Guide to Ship Sanitation. World Health Organization, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.