1. Allen, W. (1981). The Greek Contribution to the History of Phonetics. In R. Asher & E. Henderson (Eds.), Towards a History of Phonetics (pp. 115–122). Edinburgh University Press.
2. Allen, W. (1989). Vox Latina: A Guide to the Pronunciation of Classical Latin. Cambridge University Press.
3. Boyes, P., & Steele, P. (Eds.). (2020). Understanding Relations Between Scripts II: Early Alphabets. Oxbow Press.
4. Brown, A. (1998). Spelling Reform in Context: A Typology, List and Bibliography of English Spelling Reform Proposals. Simplified Spelling Society.
5. Carney, E. (1994). A Survey of English Spelling. Routledge.