APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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