Blanke (2000), cited in Sabine Fiedler Burger, Harald (2007). „Phraseology in planned languages”. Phraseologie: Ein internationales Handbuch zeitgenössischer Forschung. Walter de Gruyter. ISBN978-3-11-019076-2., Phraseology / Phraseologie, Walter de Gruyter (2007). стр. 779.
Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian, ур. (2016). „Идо”. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History.
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Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian, ур. (2016). „Идо”. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History.