Cita APA (7a ed.)

Digby, A. (1957). An excursion into the Americas. The Shell transport and trading co..

Cita Chicago Style (17a ed.)

Digby, Adrian. An Excursion into the Americas. [London: The Shell transport and trading co., 1957.

Cita MLA (9a ed.)

Digby, Adrian. An Excursion into the Americas. The Shell transport and trading co., 1957.