Frascona, J. L. (1964). Agency. Prentice-Hall.
Cita Chicago (17th ed.)Frascona, Joseph Lohengrin. Agency. Englewood Cliffs, N.J: Prentice-Hall, 1964.
Cita MLA (9th ed.)Frascona, Joseph Lohengrin. Agency. Prentice-Hall, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.