Cita APA (7a ed.)

Ricker, J., & Saywell, J. (1976). Europe and the modern world. Clarke, Irwin.

Cita Chicago Style (17a ed.)

Ricker, John, y John Saywell. Europe and the Modern World. Toronto Vancouver: Clarke, Irwin, 1976.

Cita MLA (9a ed.)

Ricker, John, y John Saywell. Europe and the Modern World. Clarke, Irwin, 1976.