Παραπομπή σε μορφή APA (7η εκδ.)

Spear, D. N. (1961). Bibliography of American directories through 1860. American Antiquarian Society.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Spear, Dorothea N. Bibliography of American Directories Through 1860. Worcester, Mass.: American Antiquarian Society, 1961.

Παραπομπή σε μορφή MLA (8th εκδ.)

Spear, Dorothea N. Bibliography of American Directories Through 1860. American Antiquarian Society, 1961.