Hartridge, G. (1898). The refraction of the eye: A manual for students (9th ed.). J. & A. Churchill.
Chicago-viite (17. p.)Hartridge, Gustavus. The Refraction of the Eye: A Manual for Students. 9th ed. London: J. & A. Churchill, 1898.
MLA-viite (8. p.)Hartridge, Gustavus. The Refraction of the Eye: A Manual for Students. 9th ed. J. & A. Churchill, 1898.
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