Sharepoint - SharePoint 2013 REST display lookup fields?

In order to select User or Lookup field values the $expand operator is used (for making a projection of AnnouncedBy column with User Information List).

For example, the following query

https://contoso.sharepoint.com/news/_api/web/lists/getByTitle('Announcements')/items?$select=*,AnnouncedBy/Title&$expand=AnnouncedBy

will return the following result:

Complete example

The example demonstrates how to bind User field value in AngularJs:

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.26/angular.min.js"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.26/angular-sanitize.js"></script>
<script> 
var app = angular.module('AnnouncementsList', ['ngSanitize']);  
app.controller('ListController', function ($scope, $http) {  
    $http({  
        method: 'GET',  
        url: "https://contoso.sharepoint.com/_api/web/lists/getByTitle('Announcements')/items?$select=*,AnnouncedBy/Title&$expand=AnnouncedBy",  
        headers: { "Accept": "application/json;odata=verbose" }  
    }).success(function (data, status, headers, config) {  
        $scope.items = data.d.results;  
    }).error(function (data, status, headers, config) {  
        //error handling goes here..
    });  
});  
</script>  


<h1>Announcements</h1>  
<div ng-app="AnnouncementsList">  
    <ul ng-controller="ListController">   
        <li ng-repeat="item in items">  
            <span>{{item.Title}}</span> By <span>{{item.AnnouncedBy.Title}}</span>  
        </li>  
    </ul>  
</div>

Result

Try adding following in the URL

$select=AnnouncedBy/Id,AnnouncedBy/Title,*&$expand=AnnouncedBy

Reference:

SharePoint 2013–retrieving the lookup value of User fields using the REST API

Getting User Information with the SharePoint 2013 REST API