Anker, S., Atkinson, J., Braddick, O., Ehrlich, D., Hartley, T., & Wade, J. (1997). A preliminary analysis of visual acuity in infants followed up from the second Cambridge infant vision screening programme. PERCEPTION, 26(6), 785–786.

Anker, S., et al. “A Preliminary Analysis of Visual Acuity in Infants Followed up from the Second Cambridge Infant Vision Screening Programme.” PERCEPTION, vol. 26, no. 6, 1997, pp. 785–86.

Anker, S, J Atkinson, O Braddick, D Ehrlich, T Hartley, and J Wade. 1997. “A Preliminary Analysis of Visual Acuity in Infants Followed up from the Second Cambridge Infant Vision Screening Programme.” PERCEPTION 26 (6): 785–86.