Cita APA (7a ed.)

Ryan, D. (2014). The United States and Europe in the twentieth century. Routledge, Taylor & Francis Group.

Cita Chicago Style (17a ed.)

Ryan, David. The United States and Europe in the Twentieth Century. London: Routledge, Taylor & Francis Group, 2014.

Cita MLA (9a ed.)

Ryan, David. The United States and Europe in the Twentieth Century. Routledge, Taylor & Francis Group, 2014.