Cita APA (7a ed.)

Ross, M. (1980). Rulers and governments of the world (Repr. (twice).). Bowker.

Cita Chicago Style (17a ed.)

Ross, Martha. Rulers and Governments of the World. Repr. (twice). London ; New York: Bowker, 1980.

Cita MLA (9a ed.)

Ross, Martha. Rulers and Governments of the World. Repr. (twice). Bowker, 1980.