Cita APA (7a ed.)

Walling, D. R. (1995). At the threshold of the millenium. Phi Delta Kappa Educational Foundation.

Cita Chicago Style (17a ed.)

Walling, Donovan R. At the Threshold of the Millenium. Indiana: Phi Delta Kappa Educational Foundation, 1995.

Cita MLA (9a ed.)

Walling, Donovan R. At the Threshold of the Millenium. Phi Delta Kappa Educational Foundation, 1995.