APA (7th ed.) Citation

Unesco, Library of Congress. National Library Service for the Blind and Physically Handicapped, & Mackenzie, C. N. (1990). World braille usage ([Rev. ed].). Unesco.

Chicago Style (17th ed.) Citation

Unesco, Library of Congress. National Library Service for the Blind and Physically Handicapped, and Clutha Nantes Mackenzie. World Braille Usage. [Rev. ed]. Paris: Unesco, 1990.

MLA (9th ed.) Citation

Unesco, et al. World Braille Usage. [Rev. ed]. Unesco, 1990.