Gaya APA

Robertson, W. (1972). The Progress of Society in Europe : A Historical Outline from the Subversion of the Roman Empire to the Beginning of the Sixteenth Century . : The University of Chicago Press.

Gaya MLA

Robertson, William. "The Progress of Society in Europe : A Historical Outline from the Subversion of the Roman Empire to the Beginning of the Sixteenth Century". : The University of Chicago Press, 1972. Text.