How to Install Ubuntu Packages from a Specific Repository

1)
$apt-cache policy python-ironicclient
python-ironicclient:
  Installed: (none)
  Candidate: 0.5.1-0ubuntu1~cloud0
  Version table:
     1:2014.2.245 0
        400 http://jiocloud.rustedhalo.com/ubuntu/ trusty-testing/main amd64 Packages
     0.5.1-0ubuntu1~cloud0 0
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu/ trusty-updates/kilo/main amd64 Packages
     0.1.2-0ubuntu1 0
        500 http://in.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages

2)
$apt-get install python-ironicclient/trusty-testing

OR

$apt-get -t trusty-testing python-ironicclien