Rugg, H. O. (1938). Changing countries and changing peoples: An introduction to world geography with historical backgrounds. [s.n.
Citação do estilo Chicago (17ª ed.)Rugg, Harold Ordway. Changing Countries and Changing Peoples: An Introduction to World Geography with Historical Backgrounds. Boston, Ginn: [s.n, 1938.
Citação MLA (9ª ed.)Rugg, Harold Ordway. Changing Countries and Changing Peoples: An Introduction to World Geography with Historical Backgrounds. [s.n, 1938.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.