APA (7th ed.) Citation

Le Guin, U. K. (1993). The Earthsea quartet ([Nachdr.].). Penguin Books.

Chicago Style (17th ed.) Citation

Le Guin, Ursula K. The Earthsea Quartet. [Nachdr.]. London [u.a.]: Penguin Books, 1993.

MLA (9th ed.) Citation

Le Guin, Ursula K. The Earthsea Quartet. [Nachdr.]. Penguin Books, 1993.

Warning: These citations may not always be 100% accurate.