| 其他書名 | Report of a Study Made Under the Direction of the United States Bureau of Education by a Joint Committee of the National Education Association, Music Teachers' National Association, and Music Supervisors' National Conference |
| 出版 | U.S. Government Printing Office, 1921 |
| URL | http://books.google.com.hk/books?id=ZWKGvQEACAAJ&hl=&source=gbs_api |