On the occasion of the 100th anniversary of the City Boys Choir Oldenzaal, 2015
Boys keep on singing! : 33 songs for boys, young men and male choir
Boys keep on singing! : 33 songs for boys, young men and male choir / compilation: Mariette Effing ; editor: Peter Gonkel ; editors: Mariette Effing ; Peter Gonkel, Ivette van Laar, Ruben Smits ; editor in chief: Mariette Effing ; music notations: Femke Hottinga, Joyce-Lou van Ras, Ruben Smits ; translation and correction: Eva Pelgrom