Author
| Journal | The Horn Call |
| Year | 1986 |
| Volume | 17 |
| Issue | 1 |
| Pages | 29-30 |
Pierce, Robert O. (1986) In Memoriam: Willem Adriaan Valkenier. In: The Horn Call: Journal of the International Horn Society, Vol. 17, No. 1, pp. 29-30. Available at https://openmusiclibrary.org/article/493500/.
