Cita APA

Bull, W. E., & Williams, H. F. (1959). Semeianca del mundoMedieval description of the world. Berkeley: University of California Press.

Citación estilo Chicago

Bull, William E., and Harry F. Williams. Semeianca Del MundoMedieval Description of the World. Berkeley: University of California Press, 1959.

Cita MLA

Bull, William E., and Harry F. Williams. Semeianca Del MundoMedieval Description of the World. Berkeley: University of California Press, 1959.