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Frothingham, A. L. Jr. (1891). "Italic Studies". Archaeological News. American Journal of Archaeology. 7 (4): 534. JSTOR496497. Retrieved 27 October 2020.
Ciani & Sheldon 2010, pp.99–100. Ciani, Keith D.; Sheldon, Kennon M. (2010). "A Versus F: The Effects of Implicit Letter Priming on Cognitive Performance". British Journal of Educational Psychology. 80 (1): 99–119. doi:10.1348/000709909X466479. PMID19622200.