Page X of Joubert de la Ferté's book lists the source of the photograph as the Air ministry. As a former department of the British Government, Air Ministry works are covered by Crown Copyright. As this work was created before 1 June 1957, it is now in the public domain.
{{Information |Description={{en|1=Portrait photograph of Robert Watson-Watt}} |Source=Joubert de la Ferté, Philip [1955]. ''The Third Service''. London: Thames and Hudson. Plate 18 |Author=unknown |Date=Creation - unknown. Publication - 1955. |Permissio
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