Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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