Cita APA (7th ed.)
Purkitt, H. E. (1998). World politics: 98/99. Dushkin/McGraw-Hill.
Cita Chicago (17th ed.)
Purkitt, Helen E. World Politics: 98/99. Guilford: Dushkin/McGraw-Hill, 1998.
Cita MLA (9th ed.)
Purkitt, Helen E. World Politics: 98/99. Dushkin/McGraw-Hill, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.