Arthur, B. W.; Marshall, A.; McGillivray, D. (1993). "Worth vs Polarise Four-Dot Test". Journal of Paediatric Ophthalmology and Strabismus. 30 (1): 53–55. doi:10.3928/0191-3913-19930101-13. PMID8455128.
eyecalcs.com
Volume 1, Chapter 9. Sensory Tests and Treatment of Binocular Vision. (n.d.). Duane's Ophthalmology on CD-ROM, 2006 edition. Retrieved October 23, 2014, from http://www.eyecalcs.com/DWAN/pages/v1/v1c009.html
Arthur, B. W.; Marshall, A.; McGillivray, D. (1993). "Worth vs Polarise Four-Dot Test". Journal of Paediatric Ophthalmology and Strabismus. 30 (1): 53–55. doi:10.3928/0191-3913-19930101-13. PMID8455128.