Franklin

MLA

Elkin, William Lewis. Triangulation of Stars In the Vicinity of the North Pole. [New Haven: The Observatory, 1893.

APA

Elkin, W. Lewis. (1893). Triangulation of stars in the vicinity of the North Pole. [New Haven: The Observatory.

Chicago

Elkin, William Lewis, Triangulation of Stars In the Vicinity of the North Pole.. [New Haven: The Observatory, 1893.