A picture of Vogeltje (Lientje), Gerhard (Harry) and Maurits Elzas can be found in: D. Slier and I. Shine Hidden letters, a glimpse of Holland during World War II(New York 2007) 87
In addition, a Jokos file (number 33038) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.