- W. von Wartburg, Die Ausgliederung der romanischen Sprachräume, Bern (1950), pp. 31 ff.
- Robert L. Politzer, “On the Development of Latin Stops in Aragonese”, Word 10 (1954) 60–65.
- R. Menéndez Pidal, Origenes del español, 3rd ed. (Madrid, 1950), 256–257.
- A. Martinet, “Celtic Lenition and Western Romance Consonants,” Language 28 (1952) 192–128.
- Codice diplomatico longo bardo, Luigi Schiaparelli, editor (Rome, Vol. 1.1929, Vol. II, 1933).
- Frieda N. Politzer and Robert L. Politzer, Romance Trends in 7th and 8th Century Latin Documents, (Chapel Hill 1953), 12–13.
- A. G. Juilland and A. G. Haudricourt, Essai pour une histoire structurale du phoné- tisme français (Paris, 1949), 51; also Martinet, op. cit., Politzer, op. cit.
- Robert L. Politzer, “On the Chronology of the Simplification of Geminates in Northern France,” Modern Language Notes 66 (1951), 527–531.
- Elise Richter, Chronologische Phonetik des Französischen bis zum Ende des 8. Jahrhunderts, (Halle, 1934) par. 171.
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