APA (7th ed.) Zitazioa

Ross, R. S., & study guide by Donald C.William. (1996). American national government: Institutions, policy and participation. McGraw-Hill.

Chicago Style (17th ed.) Zitazioa

Ross, Robert S., eta study guide by Donald C.William. American National Government: Institutions, Policy and Participation. New York: McGraw-Hill, 1996.

MLA (9th ed.) Zitazioa

Ross, Robert S., eta study guide by Donald C.William. American National Government: Institutions, Policy and Participation. McGraw-Hill, 1996.