Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (8ú heag.)

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

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