| musiccentre.ca | The Canadian Music Centre |
| worldofmusicandarts.com | World of Music and Arts |
| composers21.com | The Living Composers Project |
| ndbooks.com | The Official Publisher of the poety of William Carlos Williams |
| http://musicalics.com/en/composer/Christopher-Ludwig | Christopher Ludwig's entry in the Classical Composer Database |
William Carlos Williams Series Review on Interlude:
https://interlude.hk/composers-and-their-poets-christopher-ludwig-and-william-carlos-williams/