Helen Dwight Reid Educational Foundation. (1990). Perspectives on political science. Heldref Publications.
Chicago-viite (17. p.)Helen Dwight Reid Educational Foundation. Perspectives on Political Science. Washington, D.C.: Heldref Publications, 1990.
MLA-viite (9. p.)Helen Dwight Reid Educational Foundation. Perspectives on Political Science. Heldref Publications, 1990.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.