APA (7th ed.) Zitazioa

(1978). International register of research on blindness and visual impairment / J. M. Gill and L. L. Clarke.

Chicago Style (17th ed.) Zitazioa

International Register of Research on Blindness and Visual Impairment / J. M. Gill and L. L. Clarke. 1978.

MLA (9th ed.) Zitazioa

International Register of Research on Blindness and Visual Impairment / J. M. Gill and L. L. Clarke. 1978.