APA (7th ed.) Zitazioa

Purdom, C. B. (1963). The letchworth achievement. J. M. Dont.

Chicago Style (17th ed.) Zitazioa

Purdom, Charles Benjamin. The Letchworth Achievement. Londres: J. M. Dont, 1963.

MLA (9th ed.) Zitazioa

Purdom, Charles Benjamin. The Letchworth Achievement. J. M. Dont, 1963.