Lambregs, T. 362/51: Omzendbrieven van Wereldscholen (WS): Wereldscholen-berichten.
Citazione stile Chigago Style (17a edizione)Lambregs, Trudo. 362/51: Omzendbrieven Van Wereldscholen (WS): Wereldscholen-berichten.
Citatione MLA (8a ed.)Lambregs, Trudo. 362/51: Omzendbrieven Van Wereldscholen (WS): Wereldscholen-berichten.
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