Ross, M. (1978). Rulers and governments of the world. Bowker.
Cita Chicago (17th ed.)Ross, Marthe. Rulers and Governments of the World. Bowker, 1978.
Cita MLA (9th ed.)Ross, Marthe. Rulers and Governments of the World. Bowker, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.