APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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