Bell-Berti, Fredericka; Harris, Katherine S. (1982). „Temporal patterns of coarticulation: Lip rounding”. Journal of the Acoustical Society of America. 71 (2): 449. Bibcode:1982ASAJ...71..449B. doi:10.1121/1.387466.
Lubker, James; Gay, Thomas (1982). „Anticipatory labial coarticulation: Experimental, biological and linguistic variables.”. Journal of the Acoustical Society of America. 71 (2): 437. Bibcode:1982ASAJ...71..437L. doi:10.1121/1.387447.
Bell-Berti, Fredericka; Harris, Katherine S. (1982). „Temporal patterns of coarticulation: Lip rounding”. Journal of the Acoustical Society of America. 71 (2): 449. Bibcode:1982ASAJ...71..449B. doi:10.1121/1.387466.
Lubker, James; Gay, Thomas (1982). „Anticipatory labial coarticulation: Experimental, biological and linguistic variables.”. Journal of the Acoustical Society of America. 71 (2): 437. Bibcode:1982ASAJ...71..437L. doi:10.1121/1.387447.