De complete methode voor hoorn. Composed by Jo Brouwers and Michel Hendriks. Book with CD. Composed 2009. 56 pages. Harmonia #HU 4329-400. Published by Harmonia (BT.HU-4329-400).
De complete methode voor hoorn. Composed by Jo Brouwers and Michel Hendriks. Book with CD. Composed 2008. 84 pages. Harmonia #HU 4326-400. Published by Harmonia (BT.HU-4326-400).
Handbuch für beginnende Chorsänger. Composed by Hennie Ramaekers and Nadia Loenders. Book with Online Audio. Composed 2017. 68 pages. Harmonia #HU 4356-404. Published by Harmonia (BT.HU-4356-404).
Handboek voor beginnende koorzangers. Composed by Hennie Ramaekers and Nadia Loenders. Studies & Exercises. Book with CD. Composed 2011. 68 pages. Harmonia #HU 4333-400. Published by Harmonia (BT.HU-4333-400).