Natkiel, R. (1982). Atlas of the 20th century. Facts on File.
Cita Chicago (17th ed.)Natkiel, Richard. Atlas of the 20th Century. Facts on File, 1982.
Cita MLA (9th ed.)Natkiel, Richard. Atlas of the 20th Century. Facts on File, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.