APA (7th ed.) Citation

(1984). Kensington Palace (3. ed.). Dep. of the Environment [u.a.].

Chicago Style (17th ed.) Citation

Kensington Palace. 3. ed. [London]: Dep. of the Environment [u.a.], 1984.

MLA (9th ed.) Citation

Kensington Palace. 3. ed. Dep. of the Environment [u.a.], 1984.