APA

Runciman Steven,, . (1992). The first crusade. Cambridge: Cambridge University Press.

Chicago

Runciman Steven,, . 1992. The first crusade. Cambridge: Cambridge University Press.

Harvard

Runciman Steven,, . (1992). The first crusade. Cambridge: Cambridge University Press.

MLA

Runciman Steven,, . The first crusade. Cambridge: Cambridge University Press. 1992.