How to start using Google API v3?

I downloaded and compiled the official Google's API for .Net successful removing some incompatible referenced projects (Mobile WP81 projects).

Now, I'm trying to getting started with my very first steps to use the API, I'm following the official examples of YouTube API, the big problem I have is that I can't reproduce the example because these Namespaces are missing ...so I can't import them:

Imports Google.Apis.AuthenticationImports Google.Apis.Authentication.OAuth2Imports Google.Apis.Authentication.OAuth2.DotNetOpenAuthImports Google.Apis.Samples.HelperImports Google.Apis.Youtube.v3Imports Google.Apis.Youtube.v3.Data

These are the assemblies that I have compiled and referenced in my project:

Google.Apis.Auth.dllGoogle.Apis.Auth.PlatformServices.dllGoogle.Apis.Core.dllGoogle.Apis.dllGoogle.Apis.PlatformServices.dll

Plus these external dependencies:

BouncyCastle.Crypto.dlllog4net.dllNewtonsoft.Json.dllZlib.Portable.dll

What I'm missing?.

UPDATE

I think that exists two problems, the first is that seems the example is old because the Namespace Google.Apis.Authentication seems has changed to Google.Apis.Auth, however, I still can't find the equivalent Namespaces for these:

Google.Apis.Authentication.OAuth2.DotNetOpenAuthGoogle.Apis.Samples.HelperGoogle.Apis.Youtube.v3Google.Apis.Youtube.v3.Data

And the second problem, seems that I need to download an additional Google's library/dependency to obtain the YouTube API then be able to see the YouTube Namespaces, I think so, but I don't know where to download.