It is quite common to get the SQL Server version details from following query.
SELECT @@VERSION VersionInfo
GO
Recently I have been using following SP to get version details as it also provides me few more information about the server where the SQL Server is installed.
EXEC xp_msver
GO
Watch a 60 second video on this subject
[youtube=http://www.youtube.com/watch?v=8P5TuOg3PlA]
I like to use the second one but again that is my preference.
Reference: Pinal Dave (https://blog.sqlauthority.com)