Schroeder R. C. (1989). An Outline of American Government. [Б. м.], United States Information Agency, 1989.
Citazione stile Chigago Style (17a edizione)Schroeder R. C. An Outline of American Government. [Б. м.], United States Information Agency, 1989, 1989.
Citatione MLA (9a ed.)Schroeder R. C. An Outline of American Government. [Б. м.], United States Information Agency, 1989, 1989.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.