Gaya APA

Boller, P, F., Story, R. (1988). A more perfect union : documents in U.S. history . Boston: Houghton Mifflin Co..

Gaya MLA

Boller, Paul, F.., Story, Ronald. "A more perfect union : documents in U.S. history". Boston: Houghton Mifflin Co., 1988. Text.