Cita APA (7th ed.)
Denna, E. L., Briggs, M. P., & Gibbs, J. G. (1991). Paradox: A student tutorial. Prentice-Hall.
Cita Chicago (17th ed.)
Denna, Eric L., Michael P. Briggs, i Jeff G. Gibbs. Paradox: A Student Tutorial. Englewood Cliffs, NJ: Prentice-Hall, 1991.
Cita MLA (9th ed.)
Denna, Eric L., et al. Paradox: A Student Tutorial. Prentice-Hall, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.