Title
- The Billboard 1911-03-18: Vol 23 Iss 11122
- The Billboard 1921-09-17: Vol 33 Iss 38122
- The Billboard 1922-07-29: Vol 34 Iss 30122
- The Billboard 1922-09-30: Vol 34 Iss 39122
- The Billboard 1923-10-06: Vol 35 Iss 6122
- The Billboard 1923-11-10: Vol 35 Iss 11122
- The Billboard 1924-06-21: Vol 36 Iss 25122
- University of Oklahoma WNAD Bulletin122
- The Billboard 1924-08-09: Vol 36 Iss 32121
- Prijscourant van benoodigdheden voor fotografie en projectie120
- The Billboard 1921-07-30: Vol 33 Iss 31120
- The Billboard 1922-09-16: Vol 34 Iss 37120
- The Billboard 1923-02-24: Vol 35 Iss 8120
- The first quarter-century of American broadcasting120
- Movie Pictorial, May-June 1914119
- The Billboard 1921-05-07: Vol 33 Iss 19119
- The Billboard 1921-06-04: Vol 33 Iss 23119
- The Billboard 1923-08-18: Vol 35 Iss 33119
- The Billboard 1924-04-12: Vol 36 Iss 15119
- The Billboard 1924-07-19: Vol 36 Iss 29119