- Ralph Vaughan Williams: A discovery of his music. Published 1957 by Macmillan
- Pigtails and Pernod. Published 1961 by Macmillan
- Sixty Miles from England: The English at Dieppe 1814-1914. Published 1967 by Macmillan
- In the Absence of the Emperor: London-Paris 1814-1815. Published in 1968 by Cresset
- Cheltenham: A biography. Published 1971 by Macmillan
- Singing and Dancing Wherever She Goes: A life of Maud Karpeles. Published 2011 by the English Folk Dance & Song Society
Simona wrote the libretto for Vaughan Williams's Christmas work, The First Nowell.
When Simona died in 2010, she had written two unpublished books: a prequel/sequel to Pigtails and Pernod describing her childhood before the events of her first memoir and her later adolescence, and a piece of children's fiction, The Tithe Pig.
Other than Singing and Dancing Wherever She Goes, Simona's books are no longer in print, but secondhand copies of all can be found on Amazon.