Cita APA (7a ed.)

Cortada, J. W. (1978). Two nations over time: Spain and the United States, 1776-1977. Greenwood Press.

Cita Chicago Style (17a ed.)

Cortada, James W. Two Nations over Time: Spain and the United States, 1776-1977. Westport [etc.]: Greenwood Press, 1978.

Cita MLA (9a ed.)

Cortada, James W. Two Nations over Time: Spain and the United States, 1776-1977. Greenwood Press, 1978.