Cita APA (7th ed.)

Langville, A. R. (1979). Modern world rulers: A chronology. Scarecrow Press.

Cita Chicago (17th ed.)

Langville, Alan R. Modern World Rulers: A Chronology. Metuchen, N.J.: Scarecrow Press, 1979.

Cita MLA (8th ed.)

Langville, Alan R. Modern World Rulers: A Chronology. Scarecrow Press, 1979.