Using Multiple Repositories in Controller

I'm trying to determine the best way to include a reference to more than one repo in a single controller.

I've got a "SubjectsController" which very closely follows the standard repository pattern:

class SubjectsController extends BaseController
{

    /**
     * @var Cmapp\Interfaces\SubjectRepositoryInterface $repo
     */
    public $repo;

    /**
     * __construct method
     * Inject our Subject repository
     *
     * @param SubjectRepositoryInterface $repo
     */
    public function __construct( SubjectRepositoryInterface $repo )
    {
        $this->repo = $repo;
    }

I'm fine with all of this. My issue is in my "create" method, I need to pass a list() from another model to my view for a simple form drop down.

public function create()
    {
        # List of available studies for assignment
        $studies = Study::lists('name', 'id');

        return View::make('manager.subjects.create')->with(compact('studies'));
    }

How do I access my Study repo (I do have one), so that I'm not dependent on the Eloquent Model in my controller? Do I inject it in my controller constructor alongside my Subjects repo? Do I make it available to my view using a View Composer? What's the "best practice" here?

Seems like overkill to DI this for a single method in my controller. I have tried this approach and it works fine, just not sure if this is the correct thing to do.