APA

Booth J. A., . (1989). Understanding Central America. n.p: s.n.

Chicago

Booth John A, . 1989. Understanding Central America. n.p: s.n.

Harvard

Booth J. A., . (1989). Understanding Central America. n.p: s.n.

MLA

Booth John A, . Understanding Central America. n.p: s.n. 1989.