APA

Runciman S., . (1954). A history of the crusades. Cambridge: At the University Press.

Chicago

Runciman Steven, . 1954. A history of the crusades. Cambridge: At the University Press.

Harvard

Runciman S., . (1954). A history of the crusades. Cambridge: At the University Press.

MLA

Runciman Steven, . A history of the crusades. Cambridge: At the University Press. 1954.