| Latin prose prefaces: studies in literary conventions T Janson Almqvist & Wiksell, 1964 | 620 | 1964 |
| Languages in Botswana LG Anderson, T Janson Gaborone: Longmans, 1997 | 173* | 1997 |
| Speak: A short history of languages T Janson OUP Oxford, 2002 | 137 | 2002 |
| Prose Rhythm in Medieval Latin from the 9th to the 13th Century T Janson Almqvist & Wiksell International, 1975 | 122 | 1975 |
| A natural history of Latin T Janson OUP Oxford, 2004 | 121 | 2004 |
| Birth of a national language: The history of Setswana T Janson, J Tsonope Heinemann Botswana, 1991 | 106 | 1991 |
| Sound change in perception and production T Janson Language, 18-34, 1983 | 101 | 1983 |
| Mechanisms of language change in Latin T Janson Almqvist & Wiksell International, 1979 | 88 | 1979 |
| Non-distinctive features and their use1 T Janson, R Schulman Journal of linguistics 19 (2), 321-336, 1983 | 81 | 1983 |
| Cross-linguistic trends in the frequency of CV sequences T Janson Phonology 3, 179-195, 1986 | 70 | 1986 |
| The history of languages: An introduction T Janson Oxford University Press, 2012 | 54 | 2012 |
| História das línguas: uma introdução T Janson Através da língua, 2018 | 52 | 2018 |
| Reversed lexical diffusion and lexical split: loss of-d in Stockholm T Janson The Lexicon in Phonological Change, 252, 1977 | 45 | 1977 |
| Language change and metalinguistic change: Latin to Romance and other cases T Janson Latin and the Romance languages in the early Middle Ages, 19-28, 1996 | 41 | 1996 |
| Sound change in perception: an experiment T Janson Experimental phonology, 253-260, 1986 | 37 | 1986 |
| Språken och historien T Janson Norstedts ordbok, 2002 | 36 | 2002 |
| Southern Bantu and Makua T Janson Sprache und Geschichte in Afrika 12, 63-106, 1991 | 36* | 1991 |
| Latin: Kulturen, historien, språket T Janson Pax, 2004 | 33* | 2004 |
| Vowel duration, vowel quality, and perceptual compensation T Janson Journal of Phonetics 7 (2), 93-103, 1979 | 33 | 1979 |
| Articles and plural formation in creoles: Change and universals T Janson Lingua 64 (4), 291-323, 1984 | 31 | 1984 |
