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"Fresnel lenses". Michigan Lighthouse Conservancy. 31 January 2008. Diarkibkan daripada yang asal pada 21 September 2012. Dicapai pada 9 September 2012.
"Makapu'u, HI". Anderson, Kraig. Lighthouse Friends. Diarkibkan daripada yang asal pada 5 October 2008. Dicapai pada 26 February 2009.
"Fresnel lens". Encyclopædia Britannica Online. Encyclopædia Britannica Inc. 2012. Dicapai pada 5 July 2012. Cite journal requires |journal= (bantuan)
Shishavanf, Amir Asgharzadeh; Nordin, Leland; Tjossem, Paul; Abramoff, Michael D; Toor, Fatima (2016). Engheta, Nader; Noginov, Mikhail A; Zheludev, Nikolay I (penyunting). "PMMA-based ophthalmic contact lens for vision correction of strabismus". Metamaterials, Metadevices, and Metasystems 2016. 9918. Society of Photo-Optical Instrumentation Engineers: 99180C. doi:10.1117/12.2237994. Dicapai pada 21 June 2020. Cite journal requires |journal= (bantuan)