APA (7th ed.) Zitazioa

Williamson , G. . .. (1967). Exploring bridges. Odh ams books.

Chicago Style (17th ed.) Zitazioa

Williamson , Geoffrey. Exploring Bridges. London: Odh ams books, 1967.

MLA (9th ed.) Zitazioa

Williamson , Geoffrey. Exploring Bridges. Odh ams books, 1967.