APA

Smith G. R., . (1984). The Yemens. Oxford: Clio Press.

Chicago

Smith G Rex, . 1984. The Yemens. Oxford: Clio Press.

Harvard

Smith G. R., . (1984). The Yemens. Oxford: Clio Press.

MLA

Smith G Rex, . The Yemens. Oxford: Clio Press. 1984.