APA (7th ed.) Citation

Hergé. (1974). The secret of the unicorn ([1st American ed.].). Little, Brown.

Chicago Style (17th ed.) Citation

Hergé. The Secret of the Unicorn. [1st American ed.]. Boston: Little, Brown, 1974.

MLA (9th ed.) Citation

Hergé. The Secret of the Unicorn. [1st American ed.]. Little, Brown, 1974.