When working with the managed client object model, we need to create a ClientContext class (in Microsoft.SharePoint.Client assembly) and use its Web or Site properties to access server side objects. This class is inherited from the abstract ClientRuntimeContext class (in Microsoft.SharePoint.Client.Runtime assembly). So, if you read the methods and properties of web or site, you should add the dll reference of Microsoft.SharePoint.Client.Runtime.dll.
But it is not installed by default in your machine, you need to download and install the SharePoint Server 2013 Client Components SDK from MSDN.
After the installation is done, you will find the dll in at the following location:
C:Program FilesCommon FilesMicrosoft SharedWeb Server Extensions15ISAPI
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