APA (7th ed.) Citation

McBride, J. Symmes's Theory of Concentric Spheres Demonstrating that the Earth is hollow, habitable within, and widely open about the poles.

Chicago Style (17th ed.) Citation

McBride, James. Symmes's Theory of Concentric Spheres Demonstrating That the Earth Is Hollow, Habitable Within, and Widely Open About the Poles.

MLA (9th ed.) Citation

McBride, James. Symmes's Theory of Concentric Spheres Demonstrating That the Earth Is Hollow, Habitable Within, and Widely Open About the Poles.

Warning: These citations may not always be 100% accurate.