Botha, H., Duffy, J. R., Strand, E. A., Machulda, M. M., Whitwell, J. L., & Josephs, K. A. (2014). Nonverbal oral apraxia in primary progressive aphasia and apraxia of speech. Lippincott Williams & Wilkins.

Botha, Hugo, Joseph R. Duffy, Edythe A. Strand, Mary M. Machulda, Jennifer L. Whitwell, and Keith A. Josephs. Nonverbal Oral Apraxia in Primary Progressive Aphasia and Apraxia of Speech. Lippincott Williams & Wilkins, 2014.

Botha, Hugo, et al. Nonverbal Oral Apraxia in Primary Progressive Aphasia and Apraxia of Speech. Lippincott Williams & Wilkins, 2014.