Where can I find details of the holding models for JFK, Schiphol, Heathrow and Dubai? Does anyone know the stack (holding) models for the JFK, Schiphol, Heathrow and Dubai airports? I mean, not where the aircraft hold but rather how is it planned and what concepts are used? Or how I can find that data?
Most chars can be found in the local AIP. Most charts containing such data are the 'Standard Arrival' charts, such as location, heading and holding time. 

For the  Netherlands (Because you asked for Schiphol) it would be http://www.ais-netherlands.nl/aim/index.html