APA

VIETRI L. T., BAKER R. K., POMPER G. M. & MCWILLIAMS W. C. (1987). American government. New York: Macmillan Publishing Company.

Chicago

VIETRI Lois T, BAKER Ross K, POMPER Gerald M and MCWILLIAMS Wilson C. 1987. American government. New York: Macmillan Publishing Company.

Harvard

VIETRI L. T., BAKER R. K., POMPER G. M. and MCWILLIAMS W. C. (1987). American government. New York: Macmillan Publishing Company.

MLA

VIETRI Lois T, BAKER Ross K, POMPER Gerald M and MCWILLIAMS Wilson C. American government. New York: Macmillan Publishing Company. 1987.