Cita APA (7th ed.)
Johnson, D. L. (2015). World regional geography: A development approach (11th ed.). Pearson Education.
Cita Chicago (17th ed.)
Johnson, Douglas L. World Regional Geography: A Development Approach. 11th ed. Boston: Pearson Education, 2015.
Cita MLA (9th ed.)
Johnson, Douglas L. World Regional Geography: A Development Approach. 11th ed. Pearson Education, 2015.
Atenció: Aquestes cites poden no estar 100% correctes.