Trích dẫn APA

(1972). Books about books: International exhibition on the occasion of the international book year 1972. Frankfurt and Main.

Trích dẫn kiểu Chicago

Books About Books: International Exhibition on the Occasion of the International Book Year 1972. Frankfurt and Main, 1972.

Trích dẫn MLA

Books About Books: International Exhibition on the Occasion of the International Book Year 1972. Frankfurt and Main, 1972.

Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.