Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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