In September 1941 Siegfried Lievendag was enrolled in Grade 2 of the 6th municipal commercial secondary school in The Hague.
Data on Jewish students at schools in The Hague.The records of the Joods Lyceum in The Hague contain Lists of students at schools in The Hague, including a list of students at the Joods Lyceum. These records are kept at the municipal archive in The Hague.