McAllister Byun T, Campbell H. Differential Effects of Visual-Acoustic Biofeedback Intervention for Residual Speech Errors. Front Hum Neurosci. 2016;10:567. doi: 10.3389/fnhum.2016.00567. eCollection 2016. PubMed PMID: 27891084; PubMed Central PMCID: PMC5104733.

Byun TM, Campbell H, Carey H, Liang W, Park TH, Svirsky M. Enhancing Intervention for Residual Rhotic Errors Via App-Delivered Biofeedback: A Case Study. J Speech Lang Hear Res. 2017 Jun 22;60(6S):1810-1817. doi: 10.1044/2017_JSLHR-S-16-0248. PubMed PMID: 28655050; PubMed Central PMCID: PMC5544407.

Campbell H, Harel D, Hitchcock E, McAllister Byun T. Selecting an acoustic correlate for automated measurement of American English rhotic production in children. Int J Speech Lang Pathol. 2017 Aug 10;:1-9. doi: 10.1080/17549507.2017.1359334. [Epub ahead of print] PubMed PMID: 28795872; PubMed Central PMCID: PMC6050150.

Campbell H, McAllister Byun T. Deriving individualised /r/ targets from the acoustics of children's non-rhotic vowels. Clin Linguist Phon. 2018;32(1):70-87. doi: 10.1080/02699206.2017.1330898. Epub 2017 Jul 13. PubMed PMID: 28703653; PubMed Central PMCID: PMC6039977.