- Help For World Travelers!
Phone plugs, electric plugs and voltages used around the World, international dialing codes, list of television broadcast standards found around the world.
- Interactive Units Converter
Weight and Mass, Distance and Length, Capacity and Volume, Area, Speed, Temperature, Time, Pressure, Energy, Work, Torque, Power, Circular Measure, Computer Storage.
- Ministry of foreign affairs of the Slovak Republic
- William M. Mercer - Agency
Worldwide quality of living survey - city rankings, consulting company - operational human resource consulting and implementation.