Cita APA (7th ed.)

Butler, B. (2007). Speculation. JRP Ringier [u.a.].

Cita Chicago (17th ed.)

Butler, Brian. Speculation. Zürich: JRP Ringier [u.a.], 2007.

Cita MLA (8th ed.)

Butler, Brian. Speculation. JRP Ringier [u.a.], 2007.