Register custom taxonomies 1) quote topic and 2) quote author for quote custom post type

taxonomies.php

<?php
/**
 * Taxonomies
 *
 * This file registers any custom taxonomies
 *
 * @package      Core_Functionality
 * @since        1.0.0
 * @link         https://github.com/billerickson/Core-Functionality
 * @author       Bill Erickson <[email protected]>
 * @copyright    Copyright (c) 2011, Bill Erickson
 * @license      http://opensource.org/licenses/gpl-2.0.php GNU Public License
 */


/**
 * Create Location Taxonomy
 * @since 1.0.0
 * @link http://codex.wordpress.org/Function_Reference/register_taxonomy
 */

add_action( 'init', 'tdl_register_taxonomy_quote_topic' );
add_action( 'init', 'tdl_register_taxonomy_quote_author' );

function tdl_register_taxonomy_quote_topic() {

    $labels = array( 
        'name' => _x( 'Quote Topic', 'tdl' ),
        'singular_name' => _x( 'Quote Topic', 'tdl' ),
        'search_items' => _x( 'Search Quote Topic', 'tdl' ),
        'popular_items' => _x( 'Popular Quote Topic', 'tdl' ),
        'all_items' => _x( 'All Quote Topic', 'tdl' ),
        'parent_item' => _x( 'Parent Quote Topic', 'tdl' ),
        'parent_item_colon' => _x( 'Parent Quote Topic:', 'tdl' ),
        'edit_item' => _x( 'Edit Quote Topic', 'tdl' ),
        'update_item' => _x( 'Update Quote Topic', 'tdl' ),
        'add_new_item' => _x( 'Add New Quote Topic', 'tdl' ),
        'new_item_name' => _x( 'New Quote Topic', 'tdl' ),
        'separate_items_with_commas' => _x( 'Separate quote topic with commas', 'tdl' ),
        'add_or_remove_items' => _x( 'Add or remove Quote Topic', 'tdl' ),
        'choose_from_most_used' => _x( 'Choose from most used Quote Topic', 'tdl' ),
        'menu_name' => _x( 'Quote Topics', 'tdl' ),
    );

    $args = array( 
        'labels' => $labels,
        'public' => true,
        'show_in_nav_menus' => false,
        'show_ui' => true,
        'show_tagcloud' => true,
        'hierarchical' => false,
        'show_admin_column' => true,
        'rewrite' => true,
        'query_var' => true
    );

    register_taxonomy( 'quote_topic', array('quote'), $args );
}

function tdl_register_taxonomy_quote_author() {

    $labels = array( 
        'name' => _x( 'Quote Author', 'tdl' ),
        'singular_name' => _x( 'Quote Author', 'tdl' ),
        'search_items' => _x( 'Search Quote Authors', 'tdl' ),
        'popular_items' => _x( 'Popular Quote Authors', 'tdl' ),
        'all_items' => _x( 'All Quote Authors', 'tdl' ),
        'parent_item' => _x( 'Parent Quote Author', 'tdl' ),
        'parent_item_colon' => _x( 'Parent Quote Author:', 'tdl' ),
        'edit_item' => _x( 'Edit Quote Author', 'tdl' ),
        'update_item' => _x( 'Update Quote Author', 'tdl' ),
        'add_new_item' => _x( 'Add New Quote Author', 'tdl' ),
        'new_item_name' => _x( 'New Quote Author', 'tdl' ),
        'separate_items_with_commas' => _x( 'Separate quote authors with commas', 'tdl' ),
        'add_or_remove_items' => _x( 'Add or remove Quote Authors', 'tdl' ),
        'choose_from_most_used' => _x( 'Choose from most used Quote Authors', 'tdl' ),
        'menu_name' => _x( 'Quote Authors', 'tdl' ),
    );

    $args = array( 
        'labels' => $labels,
        'public' => true,
        'show_in_nav_menus' => false,
        'show_ui' => true,
        'show_tagcloud' => true,
        'hierarchical' => false,
        'show_admin_column' => true,
        'rewrite' => true,
        'query_var' => true
    );

    register_taxonomy( 'quote_author', array('quote'), $args );
}