APA (7th ed.) Citation

Barker, R. E. (1956). Books for all: A study of international book trade. UNESCO.

Chicago Style (17th ed.) Citation

Barker, R. E. Books for All: A Study of International Book Trade. [Paris]: UNESCO, 1956.

MLA (9th ed.) Citation

Barker, R. E. Books for All: A Study of International Book Trade. UNESCO, 1956.