HW Campbell

• Campbell, H. W. (1970) Hierarchical ordering of phonetic features as a function of input modality. In G.B. Flores d’Arcais and W. J. M. Levelt (Eds.) Advances in Psycholonguistics, Amsterdam: North-Holland.
• Campbell, H. W. (1974) Phoneme Recognition by Ear and by Eye: A Distinctive Feature Analysis, unpublished dissertation, University of Nijmegen, Holland.