only google contacts info on my contacts

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http://forum.xda-developers.com – I have 4.1.1-based ROM and using the default people app to view contacts. It seems skype/whatsapp decided to display their ugly head into my google contacts thus when trying to call people, some numbers are displayed twice. example: ----------------------------------------------------------- like I have an entry for a friend's mobile on google contacts and they also decided to put in their mobile number in skype. Thus the numbers appears twice on the stock contact app and stock phone dialer.. and I don't want this. How do I restrict Android (I suppose this is system-wide?) to retrict contact (HowTos)