Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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