Cita APA (7a ed.)

Ricker, J., & Saywell, J. (1973). Europe and a wider world. Clarke, Irwin.

Cita Chicago Style (17a ed.)

Ricker, John, y John Saywell. Europe and a Wider World. Toronto [u.a.]: Clarke, Irwin, 1973.

Cita MLA (9a ed.)

Ricker, John, y John Saywell. Europe and a Wider World. Clarke, Irwin, 1973.