APA (7th ed.) Zitazioa

welch, s. .. a. (1990). American government. West Pub. Co..

Chicago Style (17th ed.) Zitazioa

welch, susan ...[et. al]. American Government. Saint Paul: West Pub. Co., 1990.

MLA (9th ed.) Zitazioa

welch, susan ...[et. al]. American Government. West Pub. Co., 1990.